diff --git a/src/Monitoring/ThreadWatcher.coffee b/src/Monitoring/ThreadWatcher.coffee
index 5a7d8d07c..4a4cf8e30 100755
--- a/src/Monitoring/ThreadWatcher.coffee
+++ b/src/Monitoring/ThreadWatcher.coffee
@@ -103,6 +103,7 @@ ThreadWatcher =
           ThreadWatcher.db.delete {boardID, threadID}
         else
           data.isDead = true
+          delete data.unread
           ThreadWatcher.db.set {boardID, threadID, val: data}
       ThreadWatcher.refresh()
     onThreadRefresh: (e) ->
@@ -157,6 +158,7 @@ ThreadWatcher =
             ThreadWatcher.db.delete {boardID, threadID}
           else
             data.isDead = true
+            delete data.unread
             ThreadWatcher.db.set {boardID, threadID, val: data}
           ThreadWatcher.refresh()
     ,