diff --git a/BUILD.gn b/BUILD.gn
index ead31ef..ba6f21f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -22,14 +22,17 @@
     defines += [ "ANGLE_DISABLE_TRACE" ]
   }
 
-  if (is_win) {
-    defines += [
-      "NO_SANITIZE_FUNCTION=",
+  if (!is_win || is_clang) {
+    defines +=
+        [ "NO_SANITIZE_FUNCTION=__attribute__((no_sanitize(\"function\")))" ]
+  } else {
+    defines += [ "NO_SANITIZE_FUNCTION=" ]
+  }
 
-      # Disable MSVC warnings about std::aligned_storage being broken before
-      # VS 2017 15.8
-      "_ENABLE_EXTENDED_ALIGNED_STORAGE",
-    ]
+  if (is_win) {
+    # Disable MSVC warnings about std::aligned_storage being broken before
+    # VS 2017 15.8
+    defines += [ "_ENABLE_EXTENDED_ALIGNED_STORAGE" ]
 
     # Diable some MSVC warnings.
     if (!is_clang) {
@@ -44,9 +47,6 @@
   } else {
     cflags_cc = [ "-std=c++17" ]
 
-    defines +=
-        [ "NO_SANITIZE_FUNCTION=__attribute__((no_sanitize(\"function\")))" ]
-
     if (!is_debug) {
       cflags += [ "-Os" ]
     }