diff --git a/test/mitmproxy/addons/test_proxyauth.py b/test/mitmproxy/addons/test_proxyauth.py
index 8b64a21bf..82517bff3 100644
--- a/test/mitmproxy/addons/test_proxyauth.py
+++ b/test/mitmproxy/addons/test_proxyauth.py
@@ -171,4 +171,4 @@ def test_handlers():
         f2 = tflow.tflow(client_conn=f.client_conn)
         up.requestheaders(f2)
         assert not f2.response
-        assert f2.metadata["proxyauth"] == ('test','test')
+        assert f2.metadata["proxyauth"] == ('test', 'test')