diff --git a/qt-ui/mainwindow.cpp b/qt-ui/mainwindow.cpp
index 9a7490576..26b1fbcee 100644
--- a/qt-ui/mainwindow.cpp
+++ b/qt-ui/mainwindow.cpp
@@ -62,6 +62,7 @@ extern "C" int updateProgress(int percent)
 {
 	if (progressDialog)
 		progressDialog->setValue(percent);
+	qApp->processEvents();
 	return progressDialogCanceled;
 }