diff --git a/django/contrib/formtools/tests.py b/django/contrib/formtools/tests.py
index feda6e041e..143857ad58 100644
--- a/django/contrib/formtools/tests.py
+++ b/django/contrib/formtools/tests.py
@@ -23,12 +23,16 @@ class TestForm(forms.Form):
 class PreviewTests(TestCase):
 
     def setUp(self):
+        self._old_root_urlconf = settings.ROOT_URLCONF
         settings.ROOT_URLCONF = 'django.contrib.formtools.test_urls'
         # Create a FormPreview instance to share between tests
         self.preview = preview.FormPreview(TestForm)
         input_template = '<input type="hidden" name="%s" value="%s" />'
         self.input = input_template % (self.preview.unused_name('stage'), "%d")
 
+    def tearDown(self):
+        settings.ROOT_URLCONF = self._old_root_urlconf
+        
     def test_unused_name(self):
         """
         Verifies name mangling to get uniue field name.