diff --git a/postgres/tests/test_manage_users.py b/postgres/tests/test_manage_users.py
index bd545155f..ab7efeff2 100644
--- a/postgres/tests/test_manage_users.py
+++ b/postgres/tests/test_manage_users.py
@@ -97,7 +97,7 @@ def test_create_or_update_user_secret(self):
 
     @mock_aws
     def test_create_or_update_user_secret_overwrites(self):
-        ssm = boto3.client("ssm")
+        ssm = boto3.client("ssm", region_name="eu-west-2")
         user_secret_name = "/test/secret"
         user_secret_string = {"username": "test_user", "password": "test_password"}
         ssm.put_parameter(Name=user_secret_name, Value="blah", Type="String")