diff --git a/backbone.js b/backbone.js
index 190cb06a..a4fd089c 100644
--- a/backbone.js
+++ b/backbone.js
@@ -253,6 +253,7 @@
       if (!options.silent) {
         this.trigger('change:' + attr, this, void 0, options);
         this.change(options);
+        this._unsetAttributes = false;
       }
       return this;
     },
@@ -389,7 +390,6 @@
         changed[attr] = void 0;
       }
       
-      this._unsetAttributes = false;
       return changed;
     },
 
diff --git a/test/model.js b/test/model.js
index bfb499ea..76dc4b0b 100644
--- a/test/model.js
+++ b/test/model.js
@@ -175,7 +175,9 @@ $(document).ready(function() {
     model.unset('a', {silent: true});
     var changedAttributes = model.changedAttributes();
     ok('a' in changedAttributes, 'changedAttributes should contain unset properties');
-    equals(changedAttributes.a, undefined);
+
+    changedAttributes = model.changedAttributes();
+    ok('a' in changedAttributes, 'changedAttributes should contain unset properties when running changedAttributes again after an unset.');
   });
 
   test("Model: using a non-default id attribute.", function() {