diff --git a/src/posix/cocoa/i_input.mm b/src/posix/cocoa/i_input.mm
index eff9640be..7eda4785d 100644
--- a/src/posix/cocoa/i_input.mm
+++ b/src/posix/cocoa/i_input.mm
@@ -479,8 +479,9 @@ void NSEventToGameMousePosition(NSEvent* inEvent, event_t* outEvent)
 	const NSView*     view = [window contentView];
 
 	const NSPoint screenPos = [NSEvent mouseLocation];
-	const NSPoint windowPos = [window convertScreenToBase:screenPos];
-	const NSPoint   viewPos = [view convertPointToBacking:windowPos];
+	const NSRect screenRect = NSMakeRect(screenPos.x, screenPos.y, 0, 0);
+	const NSRect windowRect = [window convertRectFromScreen:screenRect];
+	const NSPoint   viewPos = [view convertPointToBacking:windowRect.origin];
 	const CGFloat frameHeight = I_GetContentViewSize(window).height;
 
 	const CGFloat posX = (              viewPos.x - rbOpts.shiftX) / rbOpts.pixelScale;