diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index c7c93d7f5..39f744e27 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -204,6 +204,7 @@ public:
 
 	virtual DFrameBuffer* CreateFrameBuffer();
 
+	static void ToggleFullscreen(bool yes);
 	static bool IsFullscreen();
 	static void UseHiDPI(bool hiDPI);
 	static void SetCursor(NSCursor* cursor);
@@ -374,6 +375,14 @@ DFrameBuffer* CocoaVideo::CreateFrameBuffer()
 	return fb;
 }
 
+void CocoaVideo::ToggleFullscreen(bool yes)
+{
+	if (CocoaVideo* const video = GetInstance())
+	{
+		video->SetMode(yes, video->m_hiDPI);
+	}
+}
+
 bool CocoaVideo::IsFullscreen()
 {
 	CocoaVideo* const video = GetInstance();
@@ -555,7 +564,7 @@ bool SystemFrameBuffer::IsFullscreen()
 
 void SystemFrameBuffer::ToggleFullscreen(bool yes)
 {
-	SetMode(...);	// todo
+	CocoaVideo::ToggleFullscreen(yes);
 }