diff --git a/jupyter_server/pytest_plugin.py b/jupyter_server/pytest_plugin.py
index f187687535..892828ba5f 100644
--- a/jupyter_server/pytest_plugin.py
+++ b/jupyter_server/pytest_plugin.py
@@ -336,7 +336,7 @@ def client_fetch(*parts, headers={}, params={}, **kwargs):
 
 
 @pytest.fixture
-def jp_ws_fetch(jp_serverapp, jp_auth_header, jp_http_port, jp_base_url):
+def jp_ws_fetch(jp_serverapp, http_server_client, jp_auth_header, jp_http_port, jp_base_url):
     """Sends a websocket request to a test server.
 
     The fixture is a factory; it can be called like