diff --git a/modules/twainui/dialog_progress_ui.cpp b/modules/twainui/dialog_progress_ui.cpp
index 17f617a6..1e4cd7ac 100644
--- a/modules/twainui/dialog_progress_ui.cpp
+++ b/modules/twainui/dialog_progress_ui.cpp
@@ -28,6 +28,7 @@ Dialog_progress_ui::Dialog_progress_ui(std::function<void (ui_result)> callback,
     m_param = this;
 
     connect(this, SIGNAL(scan_finish(QString)), this, SLOT(on_scan_finish(QString)), Qt::QueuedConnection);
+    connect(this, SIGNAL(refreshPushbutton(bool)), this, SLOT(on_refreshPushbutton(bool)), Qt::QueuedConnection);
 }
 
 Dialog_progress_ui::~Dialog_progress_ui()