diff --git a/include/net/gtp.h b/include/net/gtp.h
index 894a37b87d634be653dd98b59f61bbd3be90448e..6398891b99ba0f82cbbf626b79be651f6fbf4c4f 100644
--- a/include/net/gtp.h
+++ b/include/net/gtp.h
@@ -1,5 +1,5 @@
 #ifndef _GTP_H_
-#define _GTP_H
+#define _GTP_H_
 
 /* General GTP protocol related definitions. */