diff --git a/src/LuauAST/util/isReservedIdentifier.ts b/src/LuauAST/util/isReservedIdentifier.ts
index 57d0f1c..76d900e 100644
--- a/src/LuauAST/util/isReservedIdentifier.ts
+++ b/src/LuauAST/util/isReservedIdentifier.ts
@@ -1,5 +1,5 @@
 import { globals } from "LuauAST/impl/globals";
 
 export function isReservedIdentifier(id: string) {
-	return id in globals;
+	return Object.prototype.hasOwnProperty.call(globals, id);
 }