diff --git a/src/downloadlist.cpp b/src/downloadlist.cpp
index df81fdb..1a1b46a 100644
--- a/src/downloadlist.cpp
+++ b/src/downloadlist.cpp
@@ -17,7 +17,7 @@ downloadlist::downloadlist(QWidget *parent) :
     action_dpkg(new QAction),
     action_deepin(new QAction),
     action_gdebi(new QAction),
-    output_w(new QDialog),
+    output_w(new DDialog),
     textbrowser(new QTextBrowser)
 {
     ui->setupUi(this);
diff --git a/src/downloadlist.h b/src/downloadlist.h
index 1fd81fd..e9a8b8a 100644
--- a/src/downloadlist.h
+++ b/src/downloadlist.h
@@ -6,8 +6,9 @@
 #include <QMenu>
 #include <QAction>
 
-#include <QDialog>
+#include <DDialog>
 
+DWIDGET_USE_NAMESPACE
 
 namespace Ui {
 class downloadlist;
@@ -51,7 +52,7 @@ private:
     QAction *action_deepin;
     QAction *action_gdebi;
 
-    QDialog *output_w;
+    DDialog *output_w;
     QTextBrowser *textbrowser;
 
 private slots: