diff --git a/server/game2006service/tasks/feeback.js b/server/game2006service/tasks/feeback.js
index 55c81a4a..0342fcea 100644
--- a/server/game2006service/tasks/feeback.js
+++ b/server/game2006service/tasks/feeback.js
@@ -71,7 +71,7 @@ class FeeBack {
             [
               ['!strength',
                () => {
-                 return 'strength + ' + row['item_num']
+                 return 'GREATEST(0, strength - ' + row['item_num'] + ')'
                }],
             ]
           );