diff --git a/cortex/webgl/serve.py b/cortex/webgl/serve.py
index 067f70d3f..141bd4509 100644
--- a/cortex/webgl/serve.py
+++ b/cortex/webgl/serve.py
@@ -292,7 +292,7 @@ def run(self):
     def stop(self):
         print("Stopping server")
         self.server.stop()
-        tornado.ioloop.IOLoop.current().stop()
+        self.ioloop.stop()
 
     def send(self, **msg):
         if not isinstance(msg, str):