diff --git a/lib/polyfills.ts b/lib/polyfills.ts
index 4d2c5632..006d38f1 100644
--- a/lib/polyfills.ts
+++ b/lib/polyfills.ts
@@ -46,7 +46,7 @@ const ArrayConstructors = [
 ];
 
 ArrayConstructors.forEach((ArrayConstructor) => {
-  if (!Object.prototype.hasOwnProperty.call(ArrayConstructor, 'at')) {
+  if (typeof ArrayConstructor.prototype.at !== 'function') {
     ArrayConstructor.prototype.at = at;
   }
 });