diff --git a/lib/runtime/MakeDeferredNamespaceObjectRuntime.js b/lib/runtime/MakeDeferredNamespaceObjectRuntime.js
index a256846e0..5daea85c8 100644
--- a/lib/runtime/MakeDeferredNamespaceObjectRuntime.js
+++ b/lib/runtime/MakeDeferredNamespaceObjectRuntime.js
@@ -174,7 +174,7 @@ class MakeDeferredNamespaceObjectRuntimeModule extends HelperRuntimeModule {
 				])},`,
 				`ownKeys: ${runtimeTemplate.basicFunction("", [
 					init,
-					`var keys = Reflect.ownKeys(ns).filter(${runtimeTemplate.expressionFunction('x !== "then" && x !== Symbol.toStringTag', "x")}).concat([Symbol.toStringTag]);`,
+					`var keys = Object.getOwnPropertyNames(ns).concat(Object.getOwnPropertySymbols(ns)).filter(${runtimeTemplate.expressionFunction('x !== "then" && x !== Symbol.toStringTag', "x")}).concat([Symbol.toStringTag]);`,
 					"return keys;"
 				])},`,
 				`getOwnPropertyDescriptor: ${runtimeTemplate.basicFunction("_, name", [
@@ -186,7 +186,7 @@ class MakeDeferredNamespaceObjectRuntimeModule extends HelperRuntimeModule {
 					]),
 					"}",
 					init,
-					"var desc = Reflect.getOwnPropertyDescriptor(ns, name);",
+					"var desc = Object.getOwnPropertyDescriptor(ns, name);",
 					'if (mode == 2 && name == "default" && !desc) {',
 					Template.indent("desc = { value: ns, configurable: true };"),
 					"}",