diff --git a/src/py/crankshaft/test/mock_plpy.py b/src/py/crankshaft/test/mock_plpy.py
index 63c88f6..3a3aaea 100644
--- a/src/py/crankshaft/test/mock_plpy.py
+++ b/src/py/crankshaft/test/mock_plpy.py
@@ -24,6 +24,9 @@ class MockPlPy:
     def notice(self, msg):
         self.notices.append(msg)
 
+    def debug(self, msg):
+        self.notices.append(msg)
+
     def info(self, msg):
         self.infos.append(msg)