diff --git a/src/allmydata/test/test_openmetrics.py b/src/allmydata/test/test_openmetrics.py
index a9a0e5712..9c840714c 100644
--- a/src/allmydata/test/test_openmetrics.py
+++ b/src/allmydata/test/test_openmetrics.py
@@ -96,7 +96,7 @@ class FakeStatsProvider(object):
          }
         return stats
 
-class FakeStats():
+class FakeStats(Statistics):
     def __init__(self):
         self._provider = FakeStatsProvider()