diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h
index 197e0d3..a5527c9 100644
--- a/fs/nfs/callback.h
+++ b/fs/nfs/callback.h
@@ -38,7 +38,7 @@
 struct cb_process_state {
 	__be32			drc_status;
 	struct nfs_client	*clp;
-	int			slotid;
+	u32			slotid;
 	struct net		*net;
 };