diff --git a/pkg/apis/cluster/v1alpha1/clustergateway_proxy.go b/pkg/apis/cluster/v1alpha1/clustergateway_proxy.go
index 0c5786ae..67662dc4 100644
--- a/pkg/apis/cluster/v1alpha1/clustergateway_proxy.go
+++ b/pkg/apis/cluster/v1alpha1/clustergateway_proxy.go
@@ -379,7 +379,7 @@ var (
 		config.MetaApiGroupName,
 		config.MetaApiVersionName,
 		"clustergateways",
-		"[a-z0-9]([-a-z0-9]*[a-z0-9])?",
+		"[a-z0-9]([-.a-z0-9]*[a-z0-9])?",
 		"proxy"}, "/"))
 	clusterGatewayProxyQueryKeysToEscape = []string{"dryRun"}
 	clusterGatewayProxyEscaperPrefix     = "__"