diff --git a/packages/reactive-dict/reactive-dict-tests.js b/packages/reactive-dict/reactive-dict-tests.js
index 60b22cba8e..e0de4854c2 100644
--- a/packages/reactive-dict/reactive-dict-tests.js
+++ b/packages/reactive-dict/reactive-dict-tests.js
@@ -62,3 +62,38 @@ Tinytest.add('ReactiveDict - clear() works', function (test) {
   test.equal(equalsUndefined, true);
   test.equal(all, {});
 });
+
+Tinytest.add('ReactiveDict - delete(key) works', function (test) {
+  var dict = new ReactiveDict;
+  dict.set('foo', 'bar');
+  dict.set('bar', 'foo');
+
+  var val, equals, equalsUndefined, all;
+
+  Tracker.autorun(function() {
+    val = dict.get('foo');
+  });
+  Tracker.autorun(function() {
+    equals = dict.equals('foo', 'bar');
+  });
+  Tracker.autorun(function() {
+    equalsUndefined = dict.equals('foo', undefined);
+  });
+  Tracker.autorun(function() {
+    all = dict.all();
+  });
+
+  test.equal(val, 'bar');
+  test.equal(equals, true);
+  test.equal(equalsUndefined, false);
+  test.equal(all, {foo: 'bar', bar: 'foo'});
+
+  dict.delete('foo');
+  Tracker.flush();
+
+  test.isUndefined(val);
+  test.equal(equals, false);
+  test.equal(equalsUndefined, true);
+  test.equal(all, {bar: 'foo'});
+
+});
diff --git a/packages/reactive-dict/reactive-dict.js b/packages/reactive-dict/reactive-dict.js
index 293d7126a1..5beb79d180 100644
--- a/packages/reactive-dict/reactive-dict.js
+++ b/packages/reactive-dict/reactive-dict.js
@@ -166,6 +166,24 @@ _.extend(ReactiveDict.prototype, {
 
   },
 
+  delete: function(key) {
+    var self    = this;
+    var oldKeys = self.keys;
+
+    _.each(oldKeys, function(value, oldKey) {
+      if (key == oldKey){
+        changed(self.keyDeps[oldKey]);
+        changed(self.keyValueDeps[oldKey][value]);
+        changed(self.keyValueDeps[oldKey]['undefined']);
+        delete self.keys[oldKey]; // clean up
+      }
+    });
+
+    // trigger a change regardless if any matching key found...
+    self.allDeps.changed();
+
+  },
+
   _setObject: function (object) {
     var self = this;