diff --git a/roles/network/tasks/computed_network.yml b/roles/network/tasks/computed_network.yml
index d2f7bdb1d..0fa9505a9 100644
--- a/roles/network/tasks/computed_network.yml
+++ b/roles/network/tasks/computed_network.yml
@@ -111,7 +111,7 @@
 # stick around but testing gateway response is not performed.
 - name: User wants single wired interface as static or dhcp gateway
   set_fact:
-    user_wan_iface: "{{ discovered_lan_iface }}"
+    user_wan_iface: "{{ discovered_wan_iface }}"   # Jan 2018: discovered_lan_iface was UNDEFINED on WiFi-installed RPi
   when: num_lan_interfaces == "1" and user_lan_iface == "auto" and user_wan_iface == "auto"
 
 - name: No LAN configured - 'Appliance' mode