diff --git a/libcxx/CREDITS.TXT b/libcxx/CREDITS.TXT
index aa3c8cf1a8c6e..9cdb9ae992507 100644
--- a/libcxx/CREDITS.TXT
+++ b/libcxx/CREDITS.TXT
@@ -112,6 +112,11 @@ N: Andrew Morrow
 E: andrew.c.morrow@gmail.com
 D: Minor patches and Linux fixes.
 
+N: Justin Novosad
+E: junov@google.com
+E: justin.novosad@gmail.com
+D: Minor fixes, Swift interoperability.
+
 N: Michael Park
 E: mcypark@gmail.com
 D: Implementation of <variant>.
diff --git a/libcxx/include/__split_buffer b/libcxx/include/__split_buffer
index 1e05e4df8ba0f..5355dbbff9998 100644
--- a/libcxx/include/__split_buffer
+++ b/libcxx/include/__split_buffer
@@ -30,6 +30,9 @@
 #include <__type_traits/integral_constant.h>
 #include <__type_traits/is_nothrow_assignable.h>
 #include <__type_traits/is_nothrow_constructible.h>
+#if _LIBCPP_STD_VER >= 20
+#  include <__type_traits/is_reference.h>
+#endif
 #include <__type_traits/is_swappable.h>
 #include <__type_traits/is_trivially_destructible.h>
 #include <__type_traits/is_trivially_relocatable.h>
@@ -68,8 +71,13 @@ protected:
 
 public:
   // Can't be defaulted due to _LIBCPP_COMPRESSED_PAIR not being an aggregate in C++03 and C++11.
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer_pointer_layout() : __back_cap_(nullptr) {}
-
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer_pointer_layout()
+#if _LIBCPP_STD_VER >= 20
+      // Prevents Swift compiler's C++ importer from implicitly instantiating this ctor when it's not supported.
+      requires (!is_reference_v<allocator_type>)
+#endif
+      : __back_cap_(nullptr) {}
+  
   _LIBCPP_CONSTEXPR_SINCE_CXX20
   _LIBCPP_HIDE_FROM_ABI explicit __split_buffer_pointer_layout(const allocator_type& __alloc)
       : __back_cap_(nullptr), __alloc_(__alloc) {}