diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Messages.php b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Messages.php
index 013d1ba53..38a4a96b0 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Messages.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Messages.php
@@ -401,7 +401,7 @@ trait Messages
 
 		try
 		{
-			$this->MessageSetFlag(
+			$this->MailClient()->MessageSetFlag(
 				$this->GetActionParam('Folder', ''),
 				empty($sThreadUids) ? new SequenceSet('1:*', false) : new SequenceSet(\explode(',', $sThreadUids)),
 				MessageFlag::SEEN,