diff --git a/xmodule/tests/__init__.py b/xmodule/tests/__init__.py
index 6ab4105029..da533d484c 100644
--- a/xmodule/tests/__init__.py
+++ b/xmodule/tests/__init__.py
@@ -182,7 +182,6 @@ def get_test_descriptor_system(render_template=None):
         error_tracker=Mock(name='get_test_descriptor_system.error_tracker'),
         render_template=render_template or mock_render_template,
         mixins=(InheritanceMixin, XModuleMixin),
-        field_data=field_data,
         services={'field-data': field_data},
     )
     descriptor_system.get_asides = lambda block: []