diff --git a/testsuite/openshift/objects/gateway_api/gateway.py b/testsuite/openshift/objects/gateway_api/gateway.py
index 40da1597..2bc97cd5 100644
--- a/testsuite/openshift/objects/gateway_api/gateway.py
+++ b/testsuite/openshift/objects/gateway_api/gateway.py
@@ -200,7 +200,7 @@ def expose_hostname(self, name) -> Route:
             self.route.commit()
         else:
             self.route.add_hostname(route.model.spec.host)
-        self.selector.union(route.self_selector())
+        self.selector = self.selector.union(route.self_selector())
         return HostnameWrapper(self.route, route.model.spec.host)
 
     def commit(self):