diff --git a/KMail.desktop b/KMail.desktop
index 039c188e4..9b22ee2e4 100644
--- a/KMail.desktop
+++ b/KMail.desktop
@@ -76,6 +76,7 @@ GenericName[xh]=Umxhasi Weposi
 GenericName[zh_CN]=邮件客户程序
 GenericName[zh_TW]=收發信軟體
 Terminal=false
-
 X-KDE-StartupNotify=true
+X-DBUS-StartupType=Unique
+X-DBUS-ServiceName=org.kde.kmail
 Categories=Qt;KDE;Network;