diff --git a/src/util/util_likely.h b/src/util/util_likely.h
index df71cee0a..84795ba7c 100644
--- a/src/util/util_likely.h
+++ b/src/util/util_likely.h
@@ -1,8 +1,8 @@
 #pragma once
 
 #ifdef __GNUC__
-#define likely(x)   __builtin_expect((x),1)
-#define unlikely(x) __builtin_expect((x),0)
+#define likely(x) __builtin_expect(bool(x),1)
+#define unlikely(x) __builtin_expect(bool(x),0)
 #define force_inline inline __attribute__((always_inline))
 #else
 #define likely(x)   (x)