diff --git a/tools/kefu_robot.py b/tools/kefu_robot.py
index c730b6f..cbccaaa 100644
--- a/tools/kefu_robot.py
+++ b/tools/kefu_robot.py
@@ -52,7 +52,8 @@ class SelfCheckingHandler(tornado.web.RequestHandler):
             'errmsg': '',
             'healthy': 1,
             'max_rundelay': 10
-        }))
+        },
+        separators=(',', ':')))
 
 def make_app():
     return tornado.web.Application([