diff --git a/libavutil/mem.h b/libavutil/mem.h
index 95eb9f502e..e51976f0f7 100644
--- a/libavutil/mem.h
+++ b/libavutil/mem.h
@@ -48,7 +48,7 @@
     #define av_malloc_attrib
 #endif
 
-#if defined (__GNUC__) && (__GNU__ > 4 || __GNU__ == 4 && __GNU_MINOR__ > 1)
+#if defined(__GNUC__) && (__GNU__ > 4 || __GNU__ == 4 && __GNU_MINOR__ > 1)
     #define av_alloc_size(n) __attribute__((alloc_size(n)))
 #else
     #define av_alloc_size(n)