Use `chttpd:qs` instead of `couch_httpd:qs`
diff --git a/src/couch_stats_httpd.erl b/src/couch_stats_httpd.erl
index f31fccf..0c24d88 100644
--- a/src/couch_stats_httpd.erl
+++ b/src/couch_stats_httpd.erl
@@ -105,7 +105,7 @@
     Key.
 
 flush(Req) ->
-    case couch_util:get_value("flush", couch_httpd:qs(Req)) of
+    case couch_util:get_value("flush", chttpd:qs(Req)) of
         "true" ->
             couch_stats_aggregator:flush();
         _Else ->