diff --git a/addon/-private/system/model/internal-model.js b/addon/-private/system/model/internal-model.js
index a3ce1f81a7b..a329db3c476 100644
--- a/addon/-private/system/model/internal-model.js
+++ b/addon/-private/system/model/internal-model.js
@@ -464,7 +464,9 @@ export default class InternalModel {
 
     for (let i = 0, length = changedAttributeNames.length; i < length; i++) {
       let attribute = changedAttributeNames[i];
-      let [oldData, newData] = changedAttributes[attribute];
+      let data = changedAttributes[attribute];
+      let oldData = data[0];
+      let newData = data[1];
 
       if (oldData === newData) {
         delete attrs[attribute];