diff --git a/src/plugins/coreplugin/CMakeLists.txt b/src/plugins/coreplugin/CMakeLists.txt
index 6ed9dbe2234..d7f04d88ed5 100644
--- a/src/plugins/coreplugin/CMakeLists.txt
+++ b/src/plugins/coreplugin/CMakeLists.txt
@@ -213,8 +213,6 @@ add_qtc_plugin(Core
     loggingmanager.h
     loggingviewer.cpp
     loggingviewer.h
-    mainwindow.cpp
-    mainwindow.h
     manhattanstyle.cpp
     manhattanstyle.h
     messagebox.cpp
diff --git a/src/plugins/coreplugin/coreplugin.qbs b/src/plugins/coreplugin/coreplugin.qbs
index bc4a27ff035..37c8a9b73f8 100644
--- a/src/plugins/coreplugin/coreplugin.qbs
+++ b/src/plugins/coreplugin/coreplugin.qbs
@@ -106,8 +106,6 @@ QtcPlugin {
             "loggingmanager.h",
             "loggingviewer.cpp",
             "loggingviewer.h",
-            "mainwindow.cpp",
-            "mainwindow.h",
             "manhattanstyle.cpp",
             "manhattanstyle.h",
             "messagebox.cpp",
diff --git a/src/plugins/coreplugin/mainwindow.h b/src/plugins/coreplugin/mainwindow.h
deleted file mode 100644
index fe84d72dcb3..00000000000
--- a/src/plugins/coreplugin/mainwindow.h
+++ /dev/null
@@ -1,6 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
-
-#pragma once
-
-#include "icore.h"
diff --git a/src/plugins/coreplugin/modemanager.cpp b/src/plugins/coreplugin/modemanager.cpp
index d9600188ccc..80ecfc004df 100644
--- a/src/plugins/coreplugin/modemanager.cpp
+++ b/src/plugins/coreplugin/modemanager.cpp
@@ -10,7 +10,6 @@
 #include "fancytabwidget.h"
 #include "icore.h"
 #include "imode.h"
-#include "mainwindow.h"
 
 #include <extensionsystem/pluginmanager.h>
 
diff --git a/src/plugins/coreplugin/systemsettings.cpp b/src/plugins/coreplugin/systemsettings.cpp
index 26527a4286e..b40c5058347 100644
--- a/src/plugins/coreplugin/systemsettings.cpp
+++ b/src/plugins/coreplugin/systemsettings.cpp
@@ -12,7 +12,6 @@
 #include "fileutils.h"
 #include "icore.h"
 #include "iversioncontrol.h"
-#include "mainwindow.h"
 #include "vcsmanager.h"
 
 #include <utils/algorithm.h>