diff --git a/mail/base/content/msgMail3PaneWindow.js b/mail/base/content/msgMail3PaneWindow.js
index 6bba62be4cad..5bf538284027 100644
--- a/mail/base/content/msgMail3PaneWindow.js
+++ b/mail/base/content/msgMail3PaneWindow.js
@@ -1285,7 +1285,7 @@ function ClearMessagePane()
     // hide the message header view AND the message pane...
     HideMessageHeaderPane();
     gMessageNotificationBar.clearMsgNotifications();
-	ClearPendingReadTimer();
+    ClearPendingReadTimer();
   }
 }