diff --git a/src/api/objects/LegacyObjectAPIInterceptor.js b/src/api/objects/LegacyObjectAPIInterceptor.js
index 666dcfd5c0..18bfaaac79 100644
--- a/src/api/objects/LegacyObjectAPIInterceptor.js
+++ b/src/api/objects/LegacyObjectAPIInterceptor.js
@@ -43,7 +43,7 @@ define([
         var handleLegacyMutation;
 
         var handleMutation = function (newStyleObject) {
-            var keyString = utils.makeKeyString(newStyleObject.key);
+            var keyString = utils.makeKeyString(newStyleObject.identifier);
             var oldStyleObject = this.instantiate(utils.toOldFormat(newStyleObject), keyString);
 
             // Don't trigger self
diff --git a/src/api/objects/MutableObject.js b/src/api/objects/MutableObject.js
index 1eb5fe4e0e..e4a1d477c9 100644
--- a/src/api/objects/MutableObject.js
+++ b/src/api/objects/MutableObject.js
@@ -41,7 +41,7 @@ define([
     }
 
     function qualifiedEventName(object, eventName) {
-        return [object.key.identifier, eventName].join(':');
+        return [object.identifier.key, eventName].join(':');
     }
 
     MutableObject.prototype.stopListening = function () {