diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index bb7bfecc5ab3..286824acd008 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -250,11 +250,10 @@ static inline __le16 ieee802154_get_fc_from_skb(const struct sk_buff *skb)
 	__le16 fc;
 
 	/* check if we can fc at skb_mac_header of sk buffer */
-	if (unlikely(!skb_mac_header_was_set(skb) ||
-		     (skb_tail_pointer(skb) - skb_mac_header(skb)) < 2)) {
-		WARN_ON(1);
+	if (WARN_ON(!skb_mac_header_was_set(skb) ||
+		    (skb_tail_pointer(skb) -
+		     skb_mac_header(skb)) < IEEE802154_FC_LEN))
 		return cpu_to_le16(0);
-	}
 
 	memcpy(&fc, skb_mac_header(skb), IEEE802154_FC_LEN);
 	return fc;