diff --git a/src/util/macros.h b/src/util/macros.h
index d9487688900..007006744ed 100644
--- a/src/util/macros.h
+++ b/src/util/macros.h
@@ -66,8 +66,8 @@
 #    define likely(x)   __builtin_expect(!!(x), 1)
 #    define unlikely(x) __builtin_expect(!!(x), 0)
 #  else
-#    define likely(x)   (x)
-#    define unlikely(x) (x)
+#    define likely(x)   (!!(x))
+#    define unlikely(x) (!!(x))
 #  endif
 #endif