diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 8ec8a3fcf8d4740670b16c2c1af099ef0beaa5c5..50ec73399b48a432f3824d9948e5553914c86c6b 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -138,7 +138,7 @@ bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
 }
 EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
 
-int xfrm_dev_register(struct net_device *dev)
+static int xfrm_dev_register(struct net_device *dev)
 {
 	if ((dev->features & NETIF_F_HW_ESP) && !dev->xfrmdev_ops)
 		return NOTIFY_BAD;