diff --git a/tests/test_response.py b/tests/test_response.py
index f539b422..5f32f026 100644
--- a/tests/test_response.py
+++ b/tests/test_response.py
@@ -1052,7 +1052,7 @@ def dummy_wsgi_callable(environ, start_response):
     environ = {}
 
     def dummy_start_response(status, headers, exc_info=None):
-        assert headers, [("Set-Cookie" == "a=1; Path=/")]
+        assert headers == [("Set-Cookie", "a=1; Path=/")]
 
     result = wsgiapp(environ, dummy_start_response)
     assert result == "abc"