diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index fefa4df..e301546 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -10,6 +10,7 @@
 #include <linux/utsname.h>
 #include <linux/kernel.h>
 #include <linux/ktime.h>
+#include <linux/slab.h>
 
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/xprtsock.h>