diff --git a/weave b/weave
index a3231e67..1df5e49b 100755
--- a/weave
+++ b/weave
@@ -313,10 +313,9 @@ case "$COMMAND" in
         ;;
     start)
         [ $# -gt 1 ] || usage
-        IPADDR=$1
         create_bridge
         CONTAINER=$(docker start $2)
-        with_container_netns attach $CONTAINER $IPADDR $CONTAINER_IFNAME
+        with_container_netns $CONTAINER attach $1
         echo $CONTAINER
         ;;
     attach)