diff --git a/falcon/testing/__init__.py b/falcon/testing/__init__.py
index 530c2111f..7d55fbf8d 100644
--- a/falcon/testing/__init__.py
+++ b/falcon/testing/__init__.py
@@ -115,7 +115,7 @@ def test_get_message(client):
 from falcon.testing.srmock import StartResponseMock
 from falcon.testing.test_case import TestCase
 
-__all__ = [
+__all__ = (
     # client
     'ASGIConductor',
     'Cookie',
@@ -156,7 +156,7 @@ def test_get_message(client):
     'StartResponseMock',
     # test_case
     'TestCase',
-]
+)
 
 
 # NOTE(kgriffs): Alias for backwards-compatibility with Falcon 0.2