diff --git a/validations/check-network-gateway.yaml b/validations/check-network-gateway.yaml
index c53db97bc..732e560b2 100644
--- a/validations/check-network-gateway.yaml
+++ b/validations/check-network-gateway.yaml
@@ -18,7 +18,7 @@
       undercloud_conf_path={{ tripleo_undercloud_conf_file }}
       ignore_missing=true
   - name: "Test network_gateway if different from local_ip"
-    icmp_ping: host={{ undercloud_conf.DEFAULT.network_gateway }}
+    icmp_ping: host="{{ undercloud_conf.DEFAULT.network_gateway | default('0.0.0.0') }}"
     when: >
       "undercloud_conf.DEFAULT.local_ip | default('0.0.0.0') | ipaddr('address')"
       !=