diff --git a/pkg/server/routes/openapi.go b/pkg/server/routes/openapi.go
index d920dc2a2..c9fb43b95 100644
--- a/pkg/server/routes/openapi.go
+++ b/pkg/server/routes/openapi.go
@@ -38,7 +38,7 @@ func (oa OpenAPI) Install(c *restful.Container, mux *mux.PathRecorderMux) (*hand
 	if err != nil {
 		klog.Fatalf("Failed to build open api spec for root: %v", err)
 	}
-
+	spec.Definitions = handler.PruneDefaults(spec.Definitions)
 	openAPIVersionedService, err := handler.NewOpenAPIService(spec)
 	if err != nil {
 		klog.Fatalf("Failed to create OpenAPIService: %v", err)