diff --git a/area_darwin.go b/area_darwin.go
index da55b50..50f43a3 100644
--- a/area_darwin.go
+++ b/area_darwin.go
@@ -55,7 +55,9 @@ var (
 func areaView_drawRect(self C.id, rect C.struct_xrect) {
 	s := getSysData(self)
 	// TODO clear clip rect
-	cliprect := image.Rect(int(rect.x), int(rect.y), int(rect.width), int(rect.height))
+	// rectangles in Cocoa are origin/size, not point0/point1; if we don't watch for this, weird things will happen when scrolling
+	// TODO change names EVERYWHERE ELSE to match
+	cliprect := image.Rect(int(rect.x), int(rect.y), int(rect.x + rect.width), int(rect.y + rect.height))
 	max := C.objc_msgSend_stret_rect_noargs(self, _frame)
 	cliprect = image.Rect(0, 0, int(max.width), int(max.height)).Intersect(cliprect)
 	if cliprect.Empty() {			// no intersection; nothing to paint