diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 795931fa..e958042c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -126,6 +126,7 @@ set(DOCKS_INSTALLABLE_PRIVATE_INCLUDES
     private/WidgetResizeHandler_p.h
     private/DockRegistry_p.h
     private/TabWidget_p.h
+    private/MDILayoutWidget_p.h
 )
 
 set(DOCKS_INSTALLABLE_PRIVATE_WIDGET_INCLUDES
diff --git a/src/fwd_headers/kddockwidgets/private/MDILayoutWidget_p.h b/src/fwd_headers/kddockwidgets/private/MDILayoutWidget_p.h
new file mode 100644
index 00000000..0fe42fc7
--- /dev/null
+++ b/src/fwd_headers/kddockwidgets/private/MDILayoutWidget_p.h
@@ -0,0 +1,12 @@
+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2020-2021 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sergio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#include "../../../private/MDILayoutWidget_p.h"