diff --git a/tr-bridge.c b/tr-bridge.c
index e53e743..abbbf18 100644
--- a/tr-bridge.c
+++ b/tr-bridge.c
@@ -266,8 +266,8 @@ static int tr2eth(struct bridge_state *bst)
 	osmo_revbytebits_buf(ethh.h_dest, TR_ALEN);
 	memcpy(&ethh.h_source, trh->saddr, sizeof(ethh.h_source));
 	osmo_revbytebits_buf(ethh.h_source, TR_ALEN);
-	/* We're doing 80 */
-	//ethh.h_proto = htons(
+	/* We're doing 802.3 and not Ethernet II */
+	ethh.h_proto = htons(trlen - sizeof(*trh));
 
 	mac2str_buf(eth_src, ethh.h_source);
 	mac2str_buf(eth_dst, ethh.h_dest);