diff --git a/lib/tokenize.h b/lib/tokenize.h
index 72e20452b..58fcd6b24 100644
--- a/lib/tokenize.h
+++ b/lib/tokenize.h
@@ -31,7 +31,7 @@
 #include <list>
 #include <ctime>
 
-#ifndef(__GNUC__)
+#ifndef __GNUC__
 #define __attribute__(A)
 #endif