diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 1238949..48b18da 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -982,10 +982,7 @@
 		goto out_put;
 
 	size_max = po->tx_ring.frame_size
-		- sizeof(struct skb_shared_info)
-		- po->tp_hdrlen
-		- LL_ALLOCATED_SPACE(dev)
-		- sizeof(struct sockaddr_ll);
+		- (po->tp_hdrlen - sizeof(struct sockaddr_ll));
 
 	if (size_max > dev->mtu + reserve)
 		size_max = dev->mtu + reserve;