diff --git a/llvm/utils/gn/secondary/clang/test/BUILD.gn b/llvm/utils/gn/secondary/clang/test/BUILD.gn
index a16f8ea4b07424..5cdbab8da281b9 100644
--- a/llvm/utils/gn/secondary/clang/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/test/BUILD.gn
@@ -74,9 +74,9 @@ write_lit_config("lit_site_cfg") {
   }
 
   if (llvm_enable_zlib) {
-    extra_values += [ "LLVM_ENABLE_ZLIB=1" ]
+    extra_values += [ "HAVE_LIBZ=1" ]
   } else {
-    extra_values += [ "LLVM_ENABLE_ZLIB=0" ]  # Must be 0.
+    extra_values += [ "HAVE_LIBZ=0" ]  # Must be 0.
   }
 
   if (host_cpu == "x64") {
diff --git a/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn b/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn
index b0c690193a2e6f..c03399193babac 100644
--- a/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn
@@ -85,8 +85,8 @@ write_cmake_config("lit_common_configured") {
   }
 
   if (llvm_enable_zlib) {
-    values += [ "LLVM_ENABLE_ZLIB=1" ]
+    values += [ "HAVE_LIBZ=1" ]
   } else {
-    values += [ "LLVM_ENABLE_ZLIB=0" ]
+    values += [ "HAVE_LIBZ=0" ]
   }
 }
diff --git a/llvm/utils/gn/secondary/lld/test/BUILD.gn b/llvm/utils/gn/secondary/lld/test/BUILD.gn
index 4479205a0233e7..0f8e2c13874d0e 100644
--- a/llvm/utils/gn/secondary/lld/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/lld/test/BUILD.gn
@@ -49,9 +49,9 @@ write_lit_cfg("lit_site_cfg") {
   }
 
   if (llvm_enable_zlib) {
-    extra_values += [ "LLVM_ENABLE_ZLIB=1" ]
+    extra_values += [ "HAVE_LIBZ=1" ]
   } else {
-    extra_values += [ "LLVM_ENABLE_ZLIB=0" ]  # Must be 0.
+    extra_values += [ "HAVE_LIBZ=0" ]  # Must be 0.
   }
 
   if (current_cpu == "x64" || current_cpu == "arm64" ||
diff --git a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
index 517d96d7ee89f1..96be1e98fe9b04 100644
--- a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
@@ -208,6 +208,7 @@ write_cmake_config("config") {
       "HAVE_ISATTY=",
       "HAVE_LIBPTHREAD=",
       "HAVE_PTHREAD_SETNAME_NP=",
+      "HAVE_LIBZ=",
       "HAVE_PREAD=",
       "HAVE_PTHREAD_GETSPECIFIC=",
       "HAVE_PTHREAD_H=",
@@ -226,6 +227,7 @@ write_cmake_config("config") {
       "HAVE_SYS_TIME_H=",
       "HAVE_TERMIOS_H=",
       "HAVE_UNISTD_H=",
+      "HAVE_ZLIB_H=",
       "HAVE__CHSIZE_S=1",
       "HAVE__UNWIND_BACKTRACE=",
       "stricmp=_stricmp",
@@ -244,6 +246,7 @@ write_cmake_config("config") {
       "HAVE_ISATTY=1",
       "HAVE_LIBPTHREAD=1",
       "HAVE_PTHREAD_SETNAME_NP=1",
+      "HAVE_LIBZ=1",
       "HAVE_PREAD=1",
       "HAVE_PTHREAD_GETSPECIFIC=1",
       "HAVE_PTHREAD_H=1",
@@ -262,6 +265,7 @@ write_cmake_config("config") {
       "HAVE_SYS_TIME_H=1",
       "HAVE_TERMIOS_H=1",
       "HAVE_UNISTD_H=1",
+      "HAVE_ZLIB_H=1",
       "HAVE__CHSIZE_S=",
       "HAVE__UNWIND_BACKTRACE=1",
       "stricmp=",
diff --git a/llvm/utils/gn/secondary/llvm/test/BUILD.gn b/llvm/utils/gn/secondary/llvm/test/BUILD.gn
index b9d649a0d15ec1..5ac7a72437e0fd 100644
--- a/llvm/utils/gn/secondary/llvm/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/test/BUILD.gn
@@ -166,9 +166,9 @@ write_lit_config("lit_site_cfg") {
   }
 
   if (llvm_enable_zlib) {
-    extra_values += [ "LLVM_ENABLE_ZLIB=1" ]
+    extra_values += [ "HAVE_LIBZ=1" ]
   } else {
-    extra_values += [ "LLVM_ENABLE_ZLIB=0" ]  # Must be 0.
+    extra_values += [ "HAVE_LIBZ=0" ]  # Must be 0.
   }
 }