diff --git a/weave b/weave
index 99bfdc4b..5ddb30d7 100755
--- a/weave
+++ b/weave
@@ -263,7 +263,7 @@ detach() {
 }
 
 container_weave_addrs() {
-    ip netns exec $NETNS ip addr show dev ethwe
+    ip netns exec $NETNS ip addr show dev $CONTAINER_IFNAME
 }
 
 weave_ps() {