diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index 3cf8d37e2c..57d2f3bdbf 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -557,6 +557,10 @@ void SystemBaseFrameBuffer::SetWindowedMode()
 
 void SystemBaseFrameBuffer::SetMode(const bool fullscreen, const bool hiDPI)
 {
+	assert(m_window.screen != nil);
+	assert(m_window.contentView.layer != nil);
+	m_window.contentView.layer.contentsScale = hiDPI ? m_window.screen.backingScaleFactor : 1.0;
+
 	if (fullscreen)
 	{
 		SetFullscreenMode();