diff --git a/utils.h b/utils.h
index 7cb0947..68c486c 100644
--- a/utils.h
+++ b/utils.h
@@ -17,13 +17,16 @@
 /* Portability macros */
 #ifdef __GNUC__
 # define NORETURN __attribute__((noreturn))
-# define MALLOC_FREE __attribute__((malloc(free)))
 # define NONNULL __attribute__((returns_nonnull))
 #else
 # define NORETURN
-# define MALLOC_FREE
 # define NONNULL
 #endif
+#if defined __GNUC__ && !defined __clang__
+# define MALLOC_FREE __attribute__((malloc(free)))
+#else
+# define MALLOC_FREE
+#endif
 
 #ifndef AI_IDN
 # define AI_IDN 0