diff --git a/jupyter_remote_desktop_proxy/setup_websockify.py b/jupyter_remote_desktop_proxy/setup_websockify.py
index 2b9361d8..43e45a56 100644
--- a/jupyter_remote_desktop_proxy/setup_websockify.py
+++ b/jupyter_remote_desktop_proxy/setup_websockify.py
@@ -9,9 +9,7 @@
 def setup_websockify():
     websockify = which('websockify')
     if not websockify:
-        raise RuntimeError(
-            "websockify executable not found, please install websockify"
-        )
+        raise RuntimeError("websockify executable not found, please install websockify")
 
     vncserver = which('vncserver')
     if not vncserver: