diff --git a/util-internal.h b/util-internal.h
index 509f7299..af68a9e3 100644
--- a/util-internal.h
+++ b/util-internal.h
@@ -150,7 +150,7 @@ long _evutil_weakrand(void);
 
 /* Evaluates to the same boolean value as 'p', and hints to the compiler that
  * we expect this value to be false. */
-#ifdef __GNUC__X
+#ifdef __GNUC__
 #define EVUTIL_UNLIKELY(p) __builtin_expect(!!(p),0)
 #else
 #define EVUTIL_UNLIKELY(p) (p)