diff --git a/common/lib/xmodule/xmodule/tests/test_capa_module.py b/common/lib/xmodule/xmodule/tests/test_capa_module.py
index ac6bf4b465..c0e52f2aaf 100644
--- a/common/lib/xmodule/xmodule/tests/test_capa_module.py
+++ b/common/lib/xmodule/xmodule/tests/test_capa_module.py
@@ -2109,7 +2109,6 @@ class ProblemBlockTest(unittest.TestCase):
 
 @ddt.ddt
 class ProblemBlockXMLTest(unittest.TestCase):
-    maxDiff = None
     sample_checkbox_problem_xml = textwrap.dedent("""
         <problem>
             <p>Title</p>