diff --git a/common/lib/xmodule/xmodule/x_module.py b/common/lib/xmodule/xmodule/x_module.py
index 8bbde279ad..38bb854152 100644
--- a/common/lib/xmodule/xmodule/x_module.py
+++ b/common/lib/xmodule/xmodule/x_module.py
@@ -301,6 +301,16 @@ class XModuleMixin(XBlockMixin):
         """
         return self.icon_class
 
+    def has_dynamic_children(self):
+        """
+        Returns True if this descriptor has dynamic children for a given
+        student when the module is created.
+
+        Returns False if the children of this descriptor are the same
+        children that the module will return for any student.
+        """
+        return False
+
     # Functions used in the LMS
 
     def get_score(self):
@@ -657,16 +667,6 @@ class XModuleDescriptor(XModuleMixin, HTMLSnippet, ResourceTemplates, XBlock):
         self.edited_by = self.edited_on = self.previous_version = self.update_version = self.definition_locator = None
         self.xmodule_runtime = None
 
-    def has_dynamic_children(self):
-        """
-        Returns True if this descriptor has dynamic children for a given
-        student when the module is created.
-
-        Returns False if the children of this descriptor are the same
-        children that the module will return for any student.
-        """
-        return False
-
     @classmethod
     def _translate(cls, key):
         'VS[compat]'
diff --git a/lms/djangoapps/courseware/tests/test_views.py b/lms/djangoapps/courseware/tests/test_views.py
index fe71cc4e4b..f005074282 100644
--- a/lms/djangoapps/courseware/tests/test_views.py
+++ b/lms/djangoapps/courseware/tests/test_views.py
@@ -447,7 +447,6 @@ class ProgressPageTests(ModuleStoreTestCase):
         self.section = ItemFactory(category='sequential', parent_location=self.chapter.location)
         self.vertical = ItemFactory(category='vertical', parent_location=self.section.location)
 
-    @unittest.expectedFailure
     def test_pure_ungraded_xblock(self):
         ItemFactory(category='acid', parent_location=self.vertical.location)