diff --git a/libc/src/__support/CMakeLists.txt b/libc/src/__support/CMakeLists.txt
index 66e4d808333fd..2e5a026bf423c 100644
--- a/libc/src/__support/CMakeLists.txt
+++ b/libc/src/__support/CMakeLists.txt
@@ -205,6 +205,7 @@ add_header_library(
     libc.src.__support.CPP.bit
     libc.src.__support.CPP.type_traits
     libc.src.__support.macros.optimization
+    libc.src.__support.macros.properties.types
 )
 
 add_header_library(
@@ -213,6 +214,7 @@ add_header_library(
     UInt128.h
   DEPENDS
     .uint
+    libc.src.__support.macros.properties.types
 )
 
 add_header_library(
diff --git a/libc/src/__support/CPP/CMakeLists.txt b/libc/src/__support/CPP/CMakeLists.txt
index 6c35bc7090819..6216505eae23a 100644
--- a/libc/src/__support/CPP/CMakeLists.txt
+++ b/libc/src/__support/CPP/CMakeLists.txt
@@ -49,6 +49,7 @@ add_header_library(
   DEPENDS
     .type_traits
     libc.include.llvm-libc-macros.limits_macros
+    libc.src.__support.macros.properties.types
 )
 
 add_header_library(
diff --git a/libc/src/__support/CPP/limits.h b/libc/src/__support/CPP/limits.h
index 1ffde5f9556f8..5b9b3e755c72b 100644
--- a/libc/src/__support/CPP/limits.h
+++ b/libc/src/__support/CPP/limits.h
@@ -12,7 +12,8 @@
 #include "include/llvm-libc-macros/limits-macros.h" // CHAR_BIT
 #include "src/__support/CPP/type_traits/is_integral.h"
 #include "src/__support/CPP/type_traits/is_signed.h"
-#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/attributes.h"       // LIBC_INLINE
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
 namespace LIBC_NAMESPACE {
 namespace cpp {
@@ -76,7 +77,7 @@ template <>
 struct numeric_limits<unsigned char>
     : public internal::integer_impl<unsigned char, 0, UCHAR_MAX> {};
 
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 // On platform where UInt128 resolves to __uint128_t, this specialization
 // provides the limits of UInt128.
 template <>
diff --git a/libc/src/__support/CPP/type_traits/is_integral.h b/libc/src/__support/CPP/type_traits/is_integral.h
index 2808be594b20e..68e16ff841833 100644
--- a/libc/src/__support/CPP/type_traits/is_integral.h
+++ b/libc/src/__support/CPP/type_traits/is_integral.h
@@ -11,6 +11,7 @@
 #include "src/__support/CPP/type_traits/is_same.h"
 #include "src/__support/CPP/type_traits/remove_cv.h"
 #include "src/__support/macros/attributes.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
 namespace LIBC_NAMESPACE::cpp {
 
@@ -25,7 +26,7 @@ template <typename T> struct is_integral {
 public:
   LIBC_INLINE_VAR static constexpr bool value = __is_unqualified_any_of<
       T,
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
       __int128_t, __uint128_t,
 #endif
       char, signed char, unsigned char, short, unsigned short, int,
diff --git a/libc/src/__support/CPP/type_traits/make_signed.h b/libc/src/__support/CPP/type_traits/make_signed.h
index 21302850bfd4a..4652d8b6bfa56 100644
--- a/libc/src/__support/CPP/type_traits/make_signed.h
+++ b/libc/src/__support/CPP/type_traits/make_signed.h
@@ -9,6 +9,7 @@
 #define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_SIGNED_H
 
 #include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
 namespace LIBC_NAMESPACE::cpp {
 
@@ -26,7 +27,7 @@ template <> struct make_signed<unsigned int> : type_identity<int> {};
 template <> struct make_signed<unsigned long> : type_identity<long> {};
 template <>
 struct make_signed<unsigned long long> : type_identity<long long> {};
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 template <> struct make_signed<__int128_t> : type_identity<__int128_t> {};
 template <> struct make_signed<__uint128_t> : type_identity<__int128_t> {};
 #endif
diff --git a/libc/src/__support/CPP/type_traits/make_unsigned.h b/libc/src/__support/CPP/type_traits/make_unsigned.h
index 20948014a6657..1e814ae002a77 100644
--- a/libc/src/__support/CPP/type_traits/make_unsigned.h
+++ b/libc/src/__support/CPP/type_traits/make_unsigned.h
@@ -9,6 +9,7 @@
 #define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_UNSIGNED_H
 
 #include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
 namespace LIBC_NAMESPACE::cpp {
 
@@ -31,7 +32,7 @@ template <>
 struct make_unsigned<unsigned long> : type_identity<unsigned long> {};
 template <>
 struct make_unsigned<unsigned long long> : type_identity<unsigned long long> {};
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 template <> struct make_unsigned<__int128_t> : type_identity<__uint128_t> {};
 template <> struct make_unsigned<__uint128_t> : type_identity<__uint128_t> {};
 #endif
diff --git a/libc/src/__support/UInt.h b/libc/src/__support/UInt.h
index 94c8d86fd7649..c49c8314cd495 100644
--- a/libc/src/__support/UInt.h
+++ b/libc/src/__support/UInt.h
@@ -14,9 +14,10 @@
 #include "src/__support/CPP/limits.h"
 #include "src/__support/CPP/optional.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/macros/attributes.h"   // LIBC_INLINE
-#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
-#include "src/__support/math_extras.h"         // SumCarry, DiffBorrow
+#include "src/__support/macros/attributes.h"       // LIBC_INLINE
+#include "src/__support/macros/optimization.h"     // LIBC_UNLIKELY
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
+#include "src/__support/math_extras.h"             // SumCarry, DiffBorrow
 #include "src/__support/number_pair.h"
 
 #include <stddef.h> // For size_t
@@ -30,9 +31,9 @@ template <typename T> struct half_width;
 template <> struct half_width<uint64_t> : cpp::type_identity<uint32_t> {};
 template <> struct half_width<uint32_t> : cpp::type_identity<uint16_t> {};
 template <> struct half_width<uint16_t> : cpp::type_identity<uint8_t> {};
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 template <> struct half_width<__uint128_t> : cpp::type_identity<uint64_t> {};
-#endif // __SIZEOF_INT128__
+#endif // LIBC_TYPES_HAS_INT128
 
 template <typename T> using half_width_t = typename half_width<T>::type;
 
@@ -69,7 +70,7 @@ LIBC_INLINE constexpr NumberPair<uint32_t> full_mul<uint32_t>(uint32_t a,
   return result;
 }
 
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 template <>
 LIBC_INLINE constexpr NumberPair<uint64_t> full_mul<uint64_t>(uint64_t a,
                                                               uint64_t b) {
@@ -79,7 +80,7 @@ LIBC_INLINE constexpr NumberPair<uint64_t> full_mul<uint64_t>(uint64_t a,
   result.hi = uint64_t(prod >> 64);
   return result;
 }
-#endif // __SIZEOF_INT128__
+#endif // LIBC_TYPES_HAS_INT128
 
 } // namespace internal
 
@@ -682,7 +683,7 @@ struct BigInt {
       val[1] = uint32_t(tmp >> 32);
       return;
     }
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
     if constexpr ((Bits == 128) && (WORD_SIZE == 64)) {
       // Use builtin 128 bits if available;
       if (s >= 128) {
@@ -696,7 +697,7 @@ struct BigInt {
       val[1] = uint64_t(tmp >> 64);
       return;
     }
-#endif // __SIZEOF_INT128__
+#endif // LIBC_TYPES_HAS_INT128
     if (LIBC_UNLIKELY(s == 0))
       return;
 
@@ -753,7 +754,7 @@ struct BigInt {
       val[1] = uint32_t(tmp >> 32);
       return;
     }
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
     if constexpr ((Bits == 128) && (WORD_SIZE == 64)) {
       // Use builtin 128 bits if available;
       if (s >= 128) {
@@ -771,7 +772,7 @@ struct BigInt {
       val[1] = uint64_t(tmp >> 64);
       return;
     }
-#endif // __SIZEOF_INT128__
+#endif // LIBC_TYPES_HAS_INT128
 
     if (LIBC_UNLIKELY(s == 0))
       return;
diff --git a/libc/src/__support/UInt128.h b/libc/src/__support/UInt128.h
index 06696b7a61581..b6ef9ca18eb01 100644
--- a/libc/src/__support/UInt128.h
+++ b/libc/src/__support/UInt128.h
@@ -10,13 +10,14 @@
 #define LLVM_LIBC_SRC___SUPPORT_UINT128_H
 
 #include "UInt.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
-#if defined(__SIZEOF_INT128__)
+#ifdef LIBC_TYPES_HAS_INT128
 using UInt128 = __uint128_t;
 using Int128 = __int128_t;
 #else
 using UInt128 = LIBC_NAMESPACE::UInt<128>;
 using Int128 = LIBC_NAMESPACE::Int<128>;
-#endif
+#endif // LIBC_TYPES_HAS_INT128
 
 #endif // LLVM_LIBC_SRC___SUPPORT_UINT128_H
diff --git a/libc/src/__support/macros/properties/types.h b/libc/src/__support/macros/properties/types.h
index 8760f78875c41..42345e4743cef 100644
--- a/libc/src/__support/macros/properties/types.h
+++ b/libc/src/__support/macros/properties/types.h
@@ -17,6 +17,8 @@
 #include "src/__support/macros/properties/cpu_features.h"
 #include "src/__support/macros/properties/os.h"
 
+#include <stdint.h> // __SIZEOF_INT128__
+
 // 'long double' properties.
 #if (LDBL_MANT_DIG == 53)
 #define LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64
@@ -26,6 +28,11 @@
 #define LIBC_TYPES_LONG_DOUBLE_IS_FLOAT128
 #endif
 
+// int128 / uint128 support
+#if defined(__SIZEOF_INT128__)
+#define LIBC_TYPES_HAS_INT128
+#endif // defined(__SIZEOF_INT128__)
+
 // -- float16 support ---------------------------------------------------------
 // TODO: move this logic to "llvm-libc-types/float16.h"
 #if defined(LIBC_TARGET_ARCH_IS_X86_64) && defined(LIBC_TARGET_CPU_HAS_SSE2)
diff --git a/libc/test/UnitTest/CMakeLists.txt b/libc/test/UnitTest/CMakeLists.txt
index 8a35f1204eb51..f7a6f4a91fabc 100644
--- a/libc/test/UnitTest/CMakeLists.txt
+++ b/libc/test/UnitTest/CMakeLists.txt
@@ -73,6 +73,7 @@ add_unittest_framework_library(
     libc.src.__support.CPP.string_view
     libc.src.__support.CPP.type_traits
     libc.src.__support.fixed_point.fx_rep
+    libc.src.__support.macros.properties.types
     libc.src.__support.OSUtil.osutil
     libc.src.__support.uint
     libc.src.__support.uint128
diff --git a/libc/test/UnitTest/LibcTest.cpp b/libc/test/UnitTest/LibcTest.cpp
index 7dc85d0d4e2d7..03cd25191ecd5 100644
--- a/libc/test/UnitTest/LibcTest.cpp
+++ b/libc/test/UnitTest/LibcTest.cpp
@@ -13,6 +13,7 @@
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/UInt128.h"
 #include "src/__support/fixed_point/fx_rep.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 #include "test/UnitTest/TestLogger.h"
 
 #if __STDC_HOSTED__
@@ -215,11 +216,11 @@ TEST_SPECIALIZATION(bool);
 
 // We cannot just use a single UInt128 specialization as that resolves to only
 // one type, UInt<128> or __uint128_t. We want both overloads as we want to
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 // When builtin __uint128_t type is available, include its specialization
 // also.
 TEST_SPECIALIZATION(__uint128_t);
-#endif
+#endif // LIBC_TYPES_HAS_INT128
 
 TEST_SPECIALIZATION(LIBC_NAMESPACE::Int<128>);
 
diff --git a/libc/test/UnitTest/TestLogger.cpp b/libc/test/UnitTest/TestLogger.cpp
index 32f0ec52041fd..4756188b46cb0 100644
--- a/libc/test/UnitTest/TestLogger.cpp
+++ b/libc/test/UnitTest/TestLogger.cpp
@@ -4,6 +4,7 @@
 #include "src/__support/OSUtil/io.h" // write_to_stderr
 #include "src/__support/UInt.h"      // is_big_int
 #include "src/__support/UInt128.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
 #include <stdint.h>
 
@@ -72,9 +73,9 @@ template TestLogger &TestLogger::operator<< <unsigned long>(unsigned long);
 template TestLogger &
     TestLogger::operator<< <unsigned long long>(unsigned long long);
 
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 template TestLogger &TestLogger::operator<< <__uint128_t>(__uint128_t);
-#endif
+#endif // LIBC_TYPES_HAS_INT128
 template TestLogger &TestLogger::operator<< <UInt<128>>(UInt<128>);
 template TestLogger &TestLogger::operator<< <UInt<192>>(UInt<192>);
 template TestLogger &TestLogger::operator<< <UInt<256>>(UInt<256>);
diff --git a/libc/test/src/__support/CMakeLists.txt b/libc/test/src/__support/CMakeLists.txt
index adbacb9728ccd..91dd0dc4decfe 100644
--- a/libc/test/src/__support/CMakeLists.txt
+++ b/libc/test/src/__support/CMakeLists.txt
@@ -106,8 +106,9 @@ if(NOT LIBC_TARGET_ARCHITECTURE_IS_NVPTX)
     SRCS
       uint_test.cpp
     DEPENDS
-      libc.src.__support.uint
       libc.src.__support.CPP.optional
+      libc.src.__support.macros.properties.types
+      libc.src.__support.uint
   )
 endif()
 
@@ -118,8 +119,9 @@ add_libc_test(
   SRCS
     integer_literals_test.cpp
   DEPENDS
-    libc.src.__support.integer_literals
     libc.src.__support.CPP.optional
+    libc.src.__support.integer_literals
+    libc.src.__support.macros.properties.types
 )
 
 add_libc_test(
diff --git a/libc/test/src/__support/CPP/CMakeLists.txt b/libc/test/src/__support/CPP/CMakeLists.txt
index d7f332f5b0fbd..f94429e03b3cb 100644
--- a/libc/test/src/__support/CPP/CMakeLists.txt
+++ b/libc/test/src/__support/CPP/CMakeLists.txt
@@ -8,6 +8,7 @@ add_libc_test(
     bit_test.cpp
   DEPENDS
     libc.src.__support.CPP.bit
+    libc.src.__support.macros.properties.types
     libc.src.__support.uint
 )
 
@@ -49,6 +50,7 @@ add_libc_test(
     limits_test.cpp
   DEPENDS
     libc.src.__support.CPP.limits
+    libc.src.__support.macros.properties.types
     libc.src.__support.uint
 )
 
diff --git a/libc/test/src/__support/CPP/bit_test.cpp b/libc/test/src/__support/CPP/bit_test.cpp
index da7bb3389b2f4..3deb1f41dcf88 100644
--- a/libc/test/src/__support/CPP/bit_test.cpp
+++ b/libc/test/src/__support/CPP/bit_test.cpp
@@ -8,6 +8,7 @@
 
 #include "src/__support/CPP/bit.h"
 #include "src/__support/UInt.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 #include "test/UnitTest/Test.h"
 
 #include <stdint.h>
@@ -15,16 +16,16 @@
 namespace LIBC_NAMESPACE::cpp {
 
 using UnsignedTypesNoBigInt = testing::TypeList<
-#if defined(__SIZEOF_INT128__)
+#if defined(LIBC_TYPES_HAS_INT128)
     __uint128_t,
-#endif
+#endif // LIBC_TYPES_HAS_INT128
     unsigned char, unsigned short, unsigned int, unsigned long,
     unsigned long long>;
 
 using UnsignedTypes = testing::TypeList<
-#if defined(__SIZEOF_INT128__)
+#if defined(LIBC_TYPES_HAS_INT128)
     __uint128_t,
-#endif
+#endif // LIBC_TYPES_HAS_INT128
     unsigned char, unsigned short, unsigned int, unsigned long,
     unsigned long long, UInt<128>>;
 
diff --git a/libc/test/src/__support/CPP/limits_test.cpp b/libc/test/src/__support/CPP/limits_test.cpp
index d83e307fb1965..efcd6839d0733 100644
--- a/libc/test/src/__support/CPP/limits_test.cpp
+++ b/libc/test/src/__support/CPP/limits_test.cpp
@@ -8,6 +8,7 @@
 
 #include "src/__support/CPP/limits.h"
 #include "src/__support/UInt.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 #include "test/UnitTest/Test.h"
 
 namespace LIBC_NAMESPACE {
@@ -36,9 +37,9 @@ TEST(LlvmLibcLimitsTest, UInt128Limits) {
   auto umax64 = LIBC_NAMESPACE::UInt<128>(cpp::numeric_limits<uint64_t>::max());
   EXPECT_GT(umax128, umax64);
   ASSERT_EQ(~LIBC_NAMESPACE::UInt<128>(0), umax128);
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
   ASSERT_EQ(~__uint128_t(0), cpp::numeric_limits<__uint128_t>::max());
-#endif
+#endif // LIBC_TYPES_HAS_INT128
 }
 
 } // namespace LIBC_NAMESPACE
diff --git a/libc/test/src/__support/integer_literals_test.cpp b/libc/test/src/__support/integer_literals_test.cpp
index b8b399d9cf407..5298cf30156e2 100644
--- a/libc/test/src/__support/integer_literals_test.cpp
+++ b/libc/test/src/__support/integer_literals_test.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/integer_literals.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 #include "test/UnitTest/Test.h"
 
 using LIBC_NAMESPACE::operator""_u8;
@@ -66,7 +67,7 @@ TEST(LlvmLibcIntegerLiteralTest, u64) {
 }
 
 TEST(LlvmLibcIntegerLiteralTest, u128) {
-#if defined(__SIZEOF_INT128__)
+#ifdef LIBC_TYPES_HAS_INT128
   const __uint128_t ZERO = 0;
   const __uint128_t U8_MAX = UINT8_MAX;
   const __uint128_t U16_MAX = UINT16_MAX;
@@ -80,7 +81,7 @@ TEST(LlvmLibcIntegerLiteralTest, u128) {
   const UInt128 U32_MAX = UINT32_MAX;
   const UInt128 U64_MAX = UINT64_MAX;
   const UInt128 U128_MAX = (U64_MAX << 64) | U64_MAX;
-#endif
+#endif // LIBC_TYPES_HAS_INT128
   EXPECT_EQ(ZERO, 0_u128);
   EXPECT_EQ(U8_MAX, 255_u128);
   EXPECT_EQ(U8_MAX, 0xFF_u128);
diff --git a/libc/test/src/__support/uint_test.cpp b/libc/test/src/__support/uint_test.cpp
index eb1db9729cf4c..851656e9fcbbb 100644
--- a/libc/test/src/__support/uint_test.cpp
+++ b/libc/test/src/__support/uint_test.cpp
@@ -8,6 +8,7 @@
 
 #include "src/__support/CPP/optional.h"
 #include "src/__support/UInt.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
 #include "test/UnitTest/Test.h"
 #include <math.h> // HUGE_VALF, HUGE_VALF
@@ -41,7 +42,7 @@ TEST(LlvmLibcUIntClassTest, BitCastToFromDouble) {
   }
 }
 
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 TEST(LlvmLibcUIntClassTest, BitCastToFromNativeUint128) {
   static_assert(cpp::is_trivially_copyable<LL_UInt128>::value);
   static_assert(sizeof(LL_UInt128) == sizeof(__uint128_t));
@@ -52,7 +53,7 @@ TEST(LlvmLibcUIntClassTest, BitCastToFromNativeUint128) {
     EXPECT_TRUE(value == forth);
   }
 }
-#endif
+#endif // LIBC_TYPES_HAS_INT128
 
 #ifdef LIBC_TYPES_HAS_FLOAT128
 TEST(LlvmLibcUIntClassTest, BitCastToFromNativeFloat128) {
@@ -652,7 +653,7 @@ TEST(LlvmLibcUIntClassTest, BasicArithmeticInt128Tests) {
   ASSERT_EQ(c * b, b);
 }
 
-#ifdef __SIZEOF_INT128__
+#ifdef LIBC_TYPES_HAS_INT128
 
 TEST(LlvmLibcUIntClassTest, ConstructorFromUInt128Tests) {
   __uint128_t a = (__uint128_t(123) << 64) + 1;
@@ -707,7 +708,7 @@ TEST(LlvmLibcUIntClassTest, WordTypeUInt128Tests) {
   EXPECT_TRUE(f == r);
 }
 
-#endif // __SIZEOF_INT128__
+#endif // LIBC_TYPES_HAS_INT128
 
 TEST(LlvmLibcUIntClassTest, OtherWordTypeTests) {
   using LL_UInt96 = BigInt<96, false, uint32_t>;
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index 127059c529ecd..5f6c43cd6af7c 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -211,6 +211,7 @@ libc_support_library(
     deps = [
         "__support_cpp_type_traits",
         "__support_macros_attributes",
+        ":__support_macros_properties_types",
         ":llvm_libc_macros_limits_macros",
     ],
 )
@@ -449,6 +450,7 @@ libc_support_library(
         ":__support_cpp_type_traits",
         ":__support_macros_attributes",
         ":__support_macros_optimization",
+        ":__support_macros_properties_types",
         ":__support_math_extras",
         ":__support_number_pair",
     ],
@@ -458,6 +460,7 @@ libc_support_library(
     name = "__support_uint128",
     hdrs = ["src/__support/UInt128.h"],
     deps = [
+        ":__support_macros_properties_types",
         ":__support_uint",
     ],
 )
diff --git a/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel
index 37eb21c77e492..4a94916e1205e 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel
@@ -17,6 +17,7 @@ libc_support_library(
     deps = [
         "//libc:__support_cpp_string",
         "//libc:__support_cpp_string_view",
+        "//libc:__support_macros_properties_types",
         "//libc:__support_osutil_io",
         "//libc:__support_uint",
         "//libc:__support_uint128",
@@ -52,6 +53,7 @@ libc_support_library(
         "//libc:__support_fputil_fpbits_str",
         "//libc:__support_fputil_rounding_mode",
         "//libc:__support_macros_properties_architectures",
+        "//libc:__support_macros_properties_types",
         "//libc:__support_stringutil",
         "//libc:__support_uint128",
         "//libc:errno",
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
index 19d4c7869799a..6837b9880d5a4 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
@@ -86,6 +86,7 @@ libc_test(
     srcs = ["uint_test.cpp"],
     deps = [
         "//libc:__support_cpp_optional",
+        "//libc:__support_macros_properties_types",
         "//libc:__support_uint",
     ],
 )
@@ -111,5 +112,6 @@ libc_test(
     srcs = ["integer_literals_test.cpp"],
     deps = [
         "//libc:__support_integer_literals",
+        "//libc:__support_macros_properties_types",
     ],
 )
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel
index 07d9ac1d50082..dad1c7708e448 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel
@@ -27,6 +27,7 @@ libc_test(
     srcs = ["bit_test.cpp"],
     deps = [
         "//libc:__support_cpp_bit",
+        "//libc:__support_macros_properties_types",
         "//libc:__support_uint",
     ],
 )
@@ -48,6 +49,7 @@ libc_test(
     srcs = ["limits_test.cpp"],
     deps = [
         "//libc:__support_cpp_limits",
+        "//libc:__support_macros_properties_types",
         "//libc:__support_uint",
     ],
 )