diff --git a/ReplyTo/class.replyto.plugin.php b/ReplyTo/class.replyto.plugin.php
index 25bc773..d5ef47d 100644
--- a/ReplyTo/class.replyto.plugin.php
+++ b/ReplyTo/class.replyto.plugin.php
@@ -640,7 +640,7 @@ protected function AddReplyToButton(&$Sender) {
       if (!Gdn::Session()->UserID) return;
 
       if (isset($Sender->Discussion->PermissionCategoryID)) {
-         $CategoryID = $Sender->Discussion->CategoryPermissionID;
+         $CategoryID = $Sender->Discussion->PermissionCategoryID;
       } else {
          $CategoryID = $Sender->Discussion->CategoryID;
       }