diff --git a/QGLViewer/config.h b/QGLViewer/config.h
index 25f0e95ef4..010c54168f 100644
--- a/QGLViewer/config.h
+++ b/QGLViewer/config.h
@@ -53,6 +53,9 @@ Error : libQGLViewer requires a minimum Qt version of 5.4 Error
 #ifdef Q_OS_MAC
 # include <OpenGL/glu.h>
 #else
+#if defined(Q_OS_WIN)
+# include <QtCore/qt_windows.h>
+#endif
 # include <GL/glu.h>
 #endif