diff --git a/src/pulsecore/gccmacro.h b/src/pulsecore/gccmacro.h
index f16466533..f94a8c45a 100644
--- a/src/pulsecore/gccmacro.h
+++ b/src/pulsecore/gccmacro.h
@@ -79,7 +79,7 @@
 
 #ifndef PA_LIKELY
 #ifdef __GNUC__
-#define PA_LIKELY(x) (__builtin_expect((x),1))
+#define PA_LIKELY(x) (__builtin_expect(!!(x),1))
 #define PA_UNLIKELY(x) (__builtin_expect((x),0))
 #else
 #define PA_LIKELY(x) (x)