diff --git a/op/paint/paint.go b/op/paint/paint.go
index 3ac472b3..7ec1d2d1 100644
--- a/op/paint/paint.go
+++ b/op/paint/paint.go
@@ -63,6 +63,7 @@ func NewImageOp(src image.Image) ImageOp {
 	})
 	draw.Draw(dst, dst.Bounds(), src, src.Bounds().Min, draw.Src)
 	return ImageOp{
+		Rect:   dst.Bounds(),
 		src:    dst,
 		handle: new(int),
 	}