diff --git a/llvm/utils/gn/secondary/clang/test/BUILD.gn b/llvm/utils/gn/secondary/clang/test/BUILD.gn
index 2b5ecb166c249..874891e89c81a 100644
--- a/llvm/utils/gn/secondary/clang/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/test/BUILD.gn
@@ -75,9 +75,9 @@ 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 b0c690193a2e6..c03399193baba 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 1da191cba1517..5408ea8b6b24b 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 9f94540e4cff8..f8e1026475f5d 100644
--- a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
@@ -206,6 +206,7 @@ write_cmake_config("config") {
       "HAVE_ISATTY=",
       "HAVE_LIBPTHREAD=",
       "HAVE_PTHREAD_SETNAME_NP=",
+      "HAVE_LIBZ=",
       "HAVE_PREAD=",
       "HAVE_PTHREAD_GETSPECIFIC=",
       "HAVE_PTHREAD_H=",
@@ -224,6 +225,7 @@ 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",
@@ -242,6 +244,7 @@ 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",
@@ -260,6 +263,7 @@ 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 f5e0b1222c826..7aaaf867e1198 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.
   }
 }