diff --git a/jupyter_server/serverapp.py b/jupyter_server/serverapp.py
index 0ecb3bee78..f5902ac6f5 100755
--- a/jupyter_server/serverapp.py
+++ b/jupyter_server/serverapp.py
@@ -2023,7 +2023,7 @@ def launch_browser(self):
         if not browser:
             return
 
-        assembled_url, _ = self._prepare_browser_open()
+        assembled_url, __ = self._prepare_browser_open()
 
         b = lambda: browser.open(assembled_url, new=self.webbrowser_open_new)
         threading.Thread(target=b).start()