diff --git a/util.h b/util.h
index 347b305..5a4172d 100644
--- a/util.h
+++ b/util.h
@@ -12,7 +12,11 @@
  */
 
 #ifdef __GNUC__
+#ifdef __clang__
+#define PRINTF(i, j)	__attribute__((format (printf, i, j)))
+#else
 #define PRINTF(i, j)	__attribute__((format (gnu_printf, i, j)))
+#endif
 #define NORETURN	__attribute__((noreturn))
 #else
 #define PRINTF(i, j)