diff --git a/src/net/eth_slow.c b/src/net/eth_slow.c
index baa51dbc1..fa7a6e361 100644
--- a/src/net/eth_slow.c
+++ b/src/net/eth_slow.c
@@ -153,6 +153,14 @@ static int eth_slow_lacp_rx ( struct io_buffer *iobuf,
 
 	eth_slow_lacp_dump ( iobuf, netdev, "RX" );
 
+	/* Check for looped-back packets */
+	if ( memcmp ( lacp->actor.system, netdev->ll_addr,
+		      sizeof ( lacp->actor.system ) ) == 0 ) {
+		DBGC ( netdev, "SLOW %s RX loopback detected\n",
+		       netdev->name );
+		return -ELOOP;
+	}
+
 	/* If partner is not in sync, collecting, and distributing,
 	 * then block the link until after the next expected LACP
 	 * packet.