diff --git a/common/lib/xmodule/xmodule/modulestore/xml.py b/common/lib/xmodule/xmodule/modulestore/xml.py
index 5512af2143..90e633d8a1 100644
--- a/common/lib/xmodule/xmodule/modulestore/xml.py
+++ b/common/lib/xmodule/xmodule/modulestore/xml.py
@@ -79,7 +79,7 @@ class ImportSystem(XMLParsingSystem, MakoDescriptorSystem):
 
                 # tags that really need unique names--they store (or should store) state.
                 need_uniq_names = ('problem', 'sequential', 'video', 'course', 'chapter',
-                                   'videosequence', 'poll_question', 'timelimit')
+                                   'videosequence', 'poll_question', 'timelimit', 'vertical')
 
                 attr = xml_data.attrib
                 tag = xml_data.tag
diff --git a/common/lib/xmodule/xmodule/tests/test_import.py b/common/lib/xmodule/xmodule/tests/test_import.py
index 04a4e84f73..c1f4bb2ee2 100644
--- a/common/lib/xmodule/xmodule/tests/test_import.py
+++ b/common/lib/xmodule/xmodule/tests/test_import.py
@@ -92,6 +92,16 @@ class ImportTestCase(BaseCourseTestCase):
 
         self.assertNotEqual(descriptor1.location, descriptor2.location)
 
+        # Check that each vertical gets its very own url_name
+        bad_xml = '''<vertical display_name="abc"><problem url_name="exam1:2013_Spring:abc"/></vertical>'''
+        bad_xml2 = '''<vertical display_name="abc"><problem url_name="exam2:2013_Spring:abc"/></vertical>'''
+
+        descriptor1 = system.process_xml(bad_xml)
+        descriptor2 = system.process_xml(bad_xml2)
+
+        self.assertNotEqual(descriptor1.location, descriptor2.location)
+
+
     def test_reimport(self):
         '''Make sure an already-exported error xml tag loads properly'''