diff --git a/src/plugins/coreplugin/icore.cpp b/src/plugins/coreplugin/icore.cpp
index f6f1bca8c30..c179b57c01b 100644
--- a/src/plugins/coreplugin/icore.cpp
+++ b/src/plugins/coreplugin/icore.cpp
@@ -272,7 +272,6 @@ public:
     void aboutToShowRecentFiles();
 
     static void setFocusToEditor();
-    void aboutQtCreator();
     void changeLog();
     void contact();
     void updateFocusWidget(QWidget *old, QWidget *now);
@@ -309,7 +308,6 @@ public:
     NavigationWidget *m_leftNavigationWidget = nullptr;
     NavigationWidget *m_rightNavigationWidget = nullptr;
     RightPaneWidget *m_rightPaneWidget = nullptr;
-    VersionDialog *m_versionDialog = nullptr;
 
     QList<IContext *> m_activeContext;
 
@@ -2036,7 +2034,7 @@ void ICorePrivate::registerDefaultActions()
     aboutIdeAction.setMenuRole(QAction::AboutRole);
     aboutIdeAction.addToContainer(Constants::M_HELP, Constants::G_HELP_ABOUT);
     aboutIdeAction.setEnabled(true);
-    aboutIdeAction.addOnTriggered(this, [this] { aboutQtCreator(); });
+    aboutIdeAction.addOnTriggered(this, &showAboutQtCreator);
 
     // About Plugins Action
     ActionBuilder aboutPluginsAction(this, Constants::ABOUT_PLUGINS);
@@ -2429,27 +2427,6 @@ void ICorePrivate::aboutToShowRecentFiles()
     }
 }
 
-void ICorePrivate::aboutQtCreator()
-{
-    if (!m_versionDialog) {
-        m_versionDialog = new VersionDialog(m_mainwindow);
-        connect(m_versionDialog, &QDialog::finished,
-                this, &ICorePrivate::destroyVersionDialog);
-        ICore::registerWindow(m_versionDialog, Context("Core.VersionDialog"));
-        m_versionDialog->show();
-    } else {
-        ICore::raiseWindow(m_versionDialog);
-    }
-}
-
-void ICorePrivate::destroyVersionDialog()
-{
-    if (m_versionDialog) {
-        m_versionDialog->deleteLater();
-        m_versionDialog = nullptr;
-    }
-}
-
 class LogDialog : public QDialog
 {
 public:
diff --git a/src/plugins/coreplugin/versiondialog.cpp b/src/plugins/coreplugin/versiondialog.cpp
index 643372f729d..48a844fa8c5 100644
--- a/src/plugins/coreplugin/versiondialog.cpp
+++ b/src/plugins/coreplugin/versiondialog.cpp
@@ -16,6 +16,7 @@
 #include <utils/stringutils.h>
 #include <utils/utilsicons.h>
 
+#include <QDialog>
 #include <QDialogButtonBox>
 #include <QGridLayout>
 #include <QGuiApplication>
@@ -23,11 +24,18 @@
 #include <QLabel>
 #include <QPushButton>
 
-using namespace Core;
-using namespace Core::Internal;
+namespace Core::Internal {
 
-VersionDialog::VersionDialog(QWidget *parent)
-    : QDialog(parent)
+class VersionDialog final : public QDialog
+{
+public:
+    VersionDialog();
+
+    bool event(QEvent *event) final;
+};
+
+VersionDialog::VersionDialog()
+    : QDialog(ICore::dialogParent())
 {
     // We need to set the window icon explicitly here since for some reason the
     // application icon isn't used when the size of the dialog is fixed (at least not on X11/GNOME)
@@ -78,3 +86,27 @@ bool VersionDialog::event(QEvent *event)
     }
     return QDialog::event(event);
 }
+
+static QDialog *s_versionDialog = nullptr;
+
+static void destroyVersionDialog()
+{
+    if (s_versionDialog) {
+        s_versionDialog->deleteLater();
+        s_versionDialog = nullptr;
+    }
+}
+
+void showAboutQtCreator()
+{
+    if (s_versionDialog) {
+        ICore::raiseWindow(s_versionDialog);
+    } else {
+        s_versionDialog = new VersionDialog;
+        QObject::connect(s_versionDialog, &QDialog::finished, &destroyVersionDialog);
+        ICore::registerWindow(s_versionDialog, Context("Core.VersionDialog"));
+        s_versionDialog->show();
+    }
+}
+
+} // Core::Internal
diff --git a/src/plugins/coreplugin/versiondialog.h b/src/plugins/coreplugin/versiondialog.h
index a5bb3704807..643328cde52 100644
--- a/src/plugins/coreplugin/versiondialog.h
+++ b/src/plugins/coreplugin/versiondialog.h
@@ -3,24 +3,8 @@
 
 #pragma once
 
-#include <QDialog>
+namespace Core::Internal {
 
-QT_BEGIN_NAMESPACE
-class QEvent;
-QT_END_NAMESPACE
+void showAboutQtCreator();
 
-namespace Core {
-namespace Internal {
-
-class VersionDialog : public QDialog
-{
-    Q_OBJECT
-public:
-    explicit VersionDialog(QWidget *parent);
-
-    bool event(QEvent *event) override;
-
-};
-
-} // namespace Internal
-} // namespace Core
+} // Core::Internal