diff --git a/src/widgets/daboutdialog.cpp b/src/widgets/daboutdialog.cpp
index 3ee17afa8..93eca15b2 100644
--- a/src/widgets/daboutdialog.cpp
+++ b/src/widgets/daboutdialog.cpp
@@ -63,6 +63,7 @@ void DAboutDialogPrivate::init()
     D_Q(DAboutDialog);
 
     q->setFixedSize(540, 290);
+    q->setWindowFlags(q->windowFlags() | Qt::CustomizeWindowHint);
 
     // overwrite default info if distribution config file existed.
     loadDistributionInfo();