diff --git a/app/views/challenges/index.json.jbuilder b/app/views/challenges/index.json.jbuilder
index eae72dad2..217fe1e28 100644
--- a/app/views/challenges/index.json.jbuilder
+++ b/app/views/challenges/index.json.jbuilder
@@ -20,7 +20,7 @@ if @challenges.present?
     user_passed_count = challenge.user_passed_count
     json.passed_count user_passed_count
     #json.playing_count @play_games_map.fetch(challenge.id, 0)
-    json.playing_count (challenge.games.count - user_passed_count)
+    json.playing_count (challenge.playing_count)
     json.name_url shixun_challenge_path(challenge, shixun_identifier: @shixun.identifier)
     json.open_game challenge.open_game(@shixun)
     #json.open_game challenge.open_game(@shixun, @user.id)