diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -140,7 +140,7 @@
 
 void MainWindow::newAtCoreInstance()
 {
-    auto newInstanceWidget = new AtCoreInstanceWidget();
+    auto newInstanceWidget = new AtCoreInstanceWidget(this);
     QString name = QString::number(m_instances->addTab(newInstanceWidget, i18n("Connect a printer")));
     newInstanceWidget->setObjectName(name);
     newInstanceWidget->setFileCount(m_openFiles.size());