diff --git a/kivy/uix/widget.py b/kivy/uix/widget.py
index d5227037e..ff25e9d0f 100644
--- a/kivy/uix/widget.py
+++ b/kivy/uix/widget.py
@@ -59,6 +59,7 @@ widget moves, you can bind your own callback function like this::
 __all__ = ('Widget', 'WidgetException')
 
 from kivy.event import EventDispatcher
+from kivy.factory import Factory
 from kivy.properties import NumericProperty, StringProperty, \
         AliasProperty, ReferenceListProperty, ObjectProperty, \
         ListProperty
@@ -73,6 +74,17 @@ class WidgetException(Exception):
     pass
 
 
+class WidgetMetaclass(type):
+    '''Metaclass to auto register new widget into :class:`~kivy.factory.Factory`
+
+    .. warning::
+        This metaclass is used for Widget. Don't use it directly !
+    '''
+    def __init__(mcs, name, bases, attrs):
+        super(WidgetMetaclass, mcs).__init__(name, bases, attrs)
+        Factory.register(name, cls=mcs)
+
+
 class Widget(EventDispatcher):
     '''Widget class. See module documentation for more information.
 
@@ -91,6 +103,8 @@ class Widget(EventDispatcher):
 
     '''
 
+    __metaclass__ = WidgetMetaclass
+
     def __init__(self, **kwargs):
         # Before doing anything, ensure the windows exist.
         EventLoop.ensure_window()