diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 482888da50..8b4112bec5 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -738,6 +738,11 @@ class MultiWidget(Widget):
             media = media + w.media
         return media
     media = property(_get_media)
+    
+    def __deepcopy__(self, memo):
+        obj = super(MultiWidget, self).__deepcopy__(memo)
+        obj.widgets = copy.deepcopy(self.widgets)
+        return obj
 
 class SplitDateTimeWidget(MultiWidget):
     """
diff --git a/tests/regressiontests/forms/tests.py b/tests/regressiontests/forms/tests.py
index db70500909..8757e799a9 100644
--- a/tests/regressiontests/forms/tests.py
+++ b/tests/regressiontests/forms/tests.py
@@ -39,6 +39,7 @@ from media import media_tests
 
 from fields import FieldsTests
 from validators import TestFieldWithValidators
+from widgets import WidgetTests
 
 __test__ = {
     'extra_tests': extra_tests,
diff --git a/tests/regressiontests/forms/widgets.py b/tests/regressiontests/forms/widgets.py
index d862f40b01..cc83a888cf 100644
--- a/tests/regressiontests/forms/widgets.py
+++ b/tests/regressiontests/forms/widgets.py
@@ -1269,3 +1269,43 @@ u'<input type="hidden" name="date_0" value="17.09.2007" /><input type="hidden" n
 
 """
 
+
+from django.utils import copycompat as copy
+from unittest import TestCase
+from django import forms
+
+
+class SelectAndTextWidget(forms.MultiWidget):
+    """
+    MultiWidget subclass
+    """
+    def __init__(self, choices=[]):
+        widgets = [
+            forms.RadioSelect(choices=choices),
+            forms.TextInput
+        ]
+        super(SelectAndTextWidget, self).__init__(widgets)
+    
+    def _set_choices(self, choices):
+        """
+        When choices are set for this widget, we want to pass those along to the Select widget
+        """
+        self.widgets[0].choices = choices
+    def _get_choices(self):
+        """
+        The choices for this widget are the Select widget's choices
+        """
+        return self.widgets[0].choices
+    choices = property(_get_choices, _set_choices)
+
+
+class WidgetTests(TestCase):
+
+    def test_12048(self):
+        # See ticket #12048.
+        w1 = SelectAndTextWidget(choices=[1,2,3])
+        w2 = copy.deepcopy(w1)
+        w2.choices = [4,5,6]
+        # w2 ought to be independent of w1, since MultiWidget ought
+        # to make a copy of its sub-widgets when it is copied.
+        self.assertEqual(w1.choices, [1,2,3])