diff --git a/src/node.c b/src/node.c
index c209f44..13ddddc 100644
--- a/src/node.c
+++ b/src/node.c
@@ -13,6 +13,13 @@
 #include "slug.h"
 #include "zmalloc.h"
 
+#ifdef __GNUC__
+#	define likely(x)   __builtin_expect(!!(x), 1)
+#	define unlikely(x) __builtin_expect(!!(x), 0)
+#else
+#	define likely(x)   !!(x)
+#	define unlikely(x) !!(x)
+#endif
 
 #define CHECK_PTR(ptr) if (ptr == NULL) return NULL;