diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index 1f5ea11c2fdf..1779677aed46 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -248,7 +248,7 @@ static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
 		goto out_skb;
 
 	if (size > mtu) {
-		pr_debug("size = %u, mtu = %u\n", size, mtu);
+		pr_debug("size = %Zu, mtu = %u\n", size, mtu);
 		err = -EINVAL;
 		goto out_skb;
 	}
diff --git a/net/ieee802154/raw.c b/net/ieee802154/raw.c
index 8b892e060491..fca44d59f97e 100644
--- a/net/ieee802154/raw.c
+++ b/net/ieee802154/raw.c
@@ -132,7 +132,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 
 	if (size > mtu) {
-		pr_debug("size = %u, mtu = %u\n", size, mtu);
+		pr_debug("size = %Zu, mtu = %u\n", size, mtu);
 		err = -EINVAL;
 		goto out_dev;
 	}