diff --git a/src/core/array-utils.js b/src/core/array-utils.js
index 850f466a39b..0be2be45939 100644
--- a/src/core/array-utils.js
+++ b/src/core/array-utils.js
@@ -3,7 +3,7 @@ const array = {
     // helper function to compare two arrays for equality
     equals(arr1, arr2) {
 
-        if (arr1.size !== arr2.size) {
+        if (arr1.length !== arr2.length) {
             return false;
         }
         for (let i = 0; i < arr1.length; i++) {