diff --git a/internal/contour/grpc.go b/internal/contour/grpc.go
index 92be2690994..4c5a0e398d7 100644
--- a/internal/contour/grpc.go
+++ b/internal/contour/grpc.go
@@ -134,9 +134,16 @@ func defaultListener() []*v2.Listener {
 							"config_source": st(map[string]*structpb.Value{
 								"api_config_source": st(map[string]*structpb.Value{
 									"api_type": sv("grpc"),
-									"cluster_name": lv(
+									"cluster_names": lv(
 										sv("xds_cluster"),
 									),
+									"grpc_services": lv(
+										st(map[string]*structpb.Value{
+											"envoy_grpc": st(map[string]*structpb.Value{
+												"cluster_name": sv("xds_cluster"),
+											}),
+										}),
+									),
 								}),
 							}),
 						}),