diff --git a/include/net/gtp.h b/include/net/gtp.h
index 894a37b87d63..6398891b99ba 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. */