diff --git a/src/qt/qt_d3d9renderer.cpp b/src/qt/qt_d3d9renderer.cpp
index 14357c12d..e7ef16f77 100644
--- a/src/qt/qt_d3d9renderer.cpp
+++ b/src/qt/qt_d3d9renderer.cpp
@@ -1,3 +1,4 @@
+#include "qt_mainwindow.hpp"
 #include "qt_d3d9renderer.hpp"
 #include <QResizeEvent>
 #include <QTimer>