diff --git a/sdk/lib/atl/atlwin.h b/sdk/lib/atl/atlwin.h
index 3f68348a4ee..76b1073ed5c 100644
--- a/sdk/lib/atl/atlwin.h
+++ b/sdk/lib/atl/atlwin.h
@@ -20,7 +20,7 @@
 
 #pragma once
 
-#ifdef __GNUC__
+#if defined(__GNUC__) || defined(__clang__)
 #define GCCU(x)    x __attribute__((unused))
 #define Unused(x)
 #else