diff --git a/test/__init__.py b/test/__init__.py
index 69759ffa4..349f30a96 100644
--- a/test/__init__.py
+++ b/test/__init__.py
@@ -583,10 +583,10 @@ def sanitize_reply(reply):
 
 class PyMongoTestCase(unittest.TestCase):
     def assertEqualCommand(self, expected, actual, msg=None):
-        self.assertEqual(expected, sanitize_cmd(actual), msg)
+        self.assertEqual(sanitize_cmd(expected), sanitize_cmd(actual), msg)
 
     def assertEqualReply(self, expected, actual, msg=None):
-        self.assertEqual(expected, sanitize_reply(actual), msg)
+        self.assertEqual(sanitize_reply(expected), sanitize_reply(actual), msg)
 
 
 class IntegrationTest(PyMongoTestCase):
diff --git a/test/test_database.py b/test/test_database.py
index c70329916..cb297eb7f 100644
--- a/test/test_database.py
+++ b/test/test_database.py
@@ -417,7 +417,7 @@ class TestDatabase(IntegrationTest):
             # getLastError includes "connectionId" in recent
             # server versions, getPrevError does not.
             error.pop("connectionId", None)
-            self.assertEqual(error, prev_error)
+            self.assertEqualReply(error, prev_error)
 
             db.test.find_one()
             self.assertEqual(None, db.error())