diff --git a/src/Content/Conversation.php b/src/Content/Conversation.php
index a86c7f508..89d9ca4c1 100644
--- a/src/Content/Conversation.php
+++ b/src/Content/Conversation.php
@@ -975,7 +975,7 @@ class Conversation
 		$condition = DBA::mergeConditions($condition,
 			["`uid` IN (0, ?) AND (`vid` != ? OR `vid` IS NULL)", $uid, Verb::getID(Activity::FOLLOW)]);
 
-		$thread_parents = Post::select(['uri-id', 'causer-id'], $condition, ['order' => ['uri-id' => false, 'uid' => true]]);
+		$thread_parents = Post::select(['uri-id', 'causer-id'], $condition, ['order' => ['uri-id' => false, 'uid']]);
 
 		$thr_parent = [];