diff --git a/roles/network/tasks/debian.yml b/roles/network/tasks/debian.yml
index 6e676c2f4..0e0c409e0 100644
--- a/roles/network/tasks/debian.yml
+++ b/roles/network/tasks/debian.yml
@@ -67,7 +67,7 @@
 - name: Copy the bridge script for has_NM
   template: dest=/etc/network/interfaces
             src=network/systemd.j2
-  when: has_NM and iiab_lan_iface == "br0"
+  when: has_NM and not wan_in_interfaces and iiab_lan_iface == "br0"
 
 # or provide keyfile layout like the XO's used way back.