diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index d850fdc828f9..9e63f252a89e 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -127,7 +127,7 @@ u32 eth_get_headlen(void *data, unsigned int len)
 	struct flow_keys keys;
 
 	/* this should never happen, but better safe than sorry */
-	if (len < sizeof(*eth))
+	if (unlikely(len < sizeof(*eth)))
 		return len;
 
 	/* parse any remaining L2/L3 headers, check for L4 */