diff --git a/openstack_tools/cmd/prometheus/routers_l3_ha.py b/openstack_tools/cmd/prometheus/routers_l3_ha.py
index b53f874..9dafb5b 100644
--- a/openstack_tools/cmd/prometheus/routers_l3_ha.py
+++ b/openstack_tools/cmd/prometheus/routers_l3_ha.py
@@ -41,7 +41,10 @@ def get_pid_files(state_path):
 def verify_router_configured(router_id, master):
     """Verify is the router is properly configured on the system."""
 
-    namespace = NetNS('qrouter-%s' % router_id)
+    try:
+        namespace = NetNS('qrouter-%s' % router_id)
+    except OSError:
+        return 0
 
     for link in namespace.get_links():
         name = link.get_attr('IFLA_IFNAME')