diff --git a/dev/View/User/MailBox/MessageView.js b/dev/View/User/MailBox/MessageView.js
index 9bfa4f7e3..045cb70bb 100644
--- a/dev/View/User/MailBox/MessageView.js
+++ b/dev/View/User/MailBox/MessageView.js
@@ -94,7 +94,7 @@ export class MailMessageView extends AbstractViewRight {
 					const message = currentMessage();
 					if (message) {
 						currentMessage(null);
-						rl.app.moveMessagesToFolderType(folderType, message.folder, [message.uid], bDelete);
+						rl.app.moveMessagesToFolderType(folderType, message.folder, new Set([message.uid]), bDelete);
 					}
 				}, this.messageVisibility);