diff --git a/script/index.coffee b/script/index.coffee
index f6979c2027..75792ea07c 100644
--- a/script/index.coffee
+++ b/script/index.coffee
@@ -834,8 +834,11 @@ api.wrap = (user) ->
           else
             calculateDelta()
             addPoints() # obviously for delta>0, but also a trick to undo accidental checkboxes
-            user.stats.mp += _.max([(1 + (task.checklist?.length or 0)), (.01 * user._statsComputed.maxMP * (1 + (task.checklist?.length or 0)))]) # MP++ per ToDo, bonus per CLI
+            mpDelta = _.max([(1 + (task.checklist?.length or 0)), (.01 * user._statsComputed.maxMP * (1 + (task.checklist?.length or 0)))]) # MP++ per ToDo, bonus per CLI
+            mpDelta *= -1 if direction is 'down'  # unticking a todo
+            user.stats.mp += mpDelta
             user.stats.mp = user._statsComputed.maxMP if user.stats.mp >= user._statsComputed.maxMP
+            user.stats.mp = 0 if user.stats.mp < 0   # BUT DO WE WANT THIS? SEE COMMIT DESCRIPTION
 
         when 'reward'
         # Don't adjust values for rewards