diff --git a/common/lib/capa/capa/tests/test_responsetypes.py b/common/lib/capa/capa/tests/test_responsetypes.py
index 99b3f1d52c7e..6b400dc65308 100644
--- a/common/lib/capa/capa/tests/test_responsetypes.py
+++ b/common/lib/capa/capa/tests/test_responsetypes.py
@@ -29,6 +29,9 @@ class ResponseTest(unittest.TestCase):
 
     xml_factory_class = None
 
+    # If something is wrong, show it to us.
+    maxDiff = None
+
     def setUp(self):
         if self.xml_factory_class:
             self.xml_factory = self.xml_factory_class()