diff --git a/demo/cabaret.py b/demo/cabaret.py
index b965834..ed59c5c 100755
--- a/demo/cabaret.py
+++ b/demo/cabaret.py
@@ -58,4 +58,5 @@ else:
     add_w_builtin()
     app.wsgi_app = WdbMiddleware(app.wsgi_app, start_disabled=True)
 
-app.run(debug=True, threaded=True, host='0.0.0.0', port=12221)
+if __name__ == '__main__':
+    app.run(debug=True, threaded=True, host='0.0.0.0', port=12221)