diff --git a/fs/9p/cache.h b/fs/9p/cache.h
index 2f96754910950b59b26ac4a2046808cc7bf043c1..247e47e54bcc2c0836a334172367a140884d5c08 100644
--- a/fs/9p/cache.h
+++ b/fs/9p/cache.h
@@ -21,6 +21,7 @@
  */
 
 #ifndef _9P_CACHE_H
+#define _9P_CACHE_H
 #ifdef CONFIG_9P_FSCACHE
 #include <linux/fscache.h>
 #include <linux/spinlock.h>