diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 4bc22c7..7e32bd3 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -32,6 +32,7 @@
  */
 
 #include <linux/sunrpc/clnt.h>
+#include <linux/slab.h>
 #include "nfsd.h"
 #include "state.h"