diff --git a/miniwin/src/d3drm/d3drmdevice.cpp b/miniwin/src/d3drm/d3drmdevice.cpp
index 40dd1137..bae67e94 100644
--- a/miniwin/src/d3drm/d3drmdevice.cpp
+++ b/miniwin/src/d3drm/d3drmdevice.cpp
@@ -158,6 +158,7 @@ void Direct3DRMDevice2Impl::Resize()
 #endif
 	m_viewportTransform = CalculateViewportTransform(m_virtualWidth, m_virtualHeight, width, height);
 	m_renderer->Resize(width, height, m_viewportTransform);
+	m_renderer->Clear(0, 0, 0);
 	for (int i = 0; i < m_viewports->GetSize(); i++) {
 		IDirect3DRMViewport* viewport;
 		m_viewports->GetElement(i, &viewport);