diff --git a/third_party/zlib/BUILD.gn b/third_party/zlib/BUILD.gn
index b44bda6..1d159d8 100644
--- ./third_party/zlib/BUILD.gn
+++ ./third_party/zlib/BUILD.gn
@@ -63,7 +63,7 @@ config("zlib_arm_crc32_config") {
     #  - ChromeOS has wrapper scripts that are borking the compiler flags.
     #  - Fuchsia just added a syscall for feature detection.
     # TODO(cavalcantii): crbug.com/810125.
-    if (!is_ios && !is_chromeos && !is_fuchsia) {
+    if (is_clang && !is_ios && !is_chromeos && !is_fuchsia) {
       defines = [ "CRC32_ARMV8_CRC32" ]
       if (is_android) {
         defines += [ "ARMV8_OS_ANDROID" ]