diff --git a/libavutil/attributes.h b/libavutil/attributes.h
index 0e49b22b9d..c9c74c28b6 100644
--- a/libavutil/attributes.h
+++ b/libavutil/attributes.h
@@ -111,7 +111,7 @@
 #    define av_cold
 #endif
 
-#if AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__llvm__)
+#if (AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__clang__ )) || AV_HAS_ATTRIBUTE(flatten)
 #    define av_flatten __attribute__((flatten))
 #else
 #    define av_flatten