diff --git a/npm/ng-packs/packages/schematics/src/utils/prop.ts b/npm/ng-packs/packages/schematics/src/utils/prop.ts
index 5109fcb721..0c78de7b14 100644
--- a/npm/ng-packs/packages/schematics/src/utils/prop.ts
+++ b/npm/ng-packs/packages/schematics/src/utils/prop.ts
@@ -1,6 +1,6 @@
 export const isValidProp = (name: string) => {
   try {
-    new Function(name, 'var ' + name);
+    new Function('return {}.' + name);
   } catch (_) {
     return false;
   }