diff --git a/tests/unit/test_client.py b/tests/unit/test_client.py
index 81bb207d5d1..d33d9cc08a8 100644
--- a/tests/unit/test_client.py
+++ b/tests/unit/test_client.py
@@ -190,10 +190,10 @@ def test_constructor_custom_query_options_client_config(self):
             expected_query_options=expected_query_options,
         )
 
-    @mock.patch("google.cloud.spanner_v1.client._get_spanner_optimizer_version")
     @mock.patch(
         "google.cloud.spanner_v1.client._get_spanner_optimizer_statistics_package"
     )
+    @mock.patch("google.cloud.spanner_v1.client._get_spanner_optimizer_version")
     def test_constructor_custom_query_options_env_config(self, mock_ver, mock_stats):
         from google.cloud.spanner_v1 import ExecuteSqlRequest
         from google.cloud.spanner_v1 import client as MUT