diff --git a/net/ieee802154/raw.c b/net/ieee802154/raw.c
index f96bae8..50e8239 100644
--- a/net/ieee802154/raw.c
+++ b/net/ieee802154/raw.c
@@ -106,7 +106,7 @@
 		       size_t size)
 {
 	struct net_device *dev;
-	unsigned mtu;
+	unsigned int mtu;
 	struct sk_buff *skb;
 	int hlen, tlen;
 	int err;