diff --git a/vlib/gg/image.v b/vlib/gg/image.v
index ea8ef11683..1ac31339cc 100644
--- a/vlib/gg/image.v
+++ b/vlib/gg/image.v
@@ -27,7 +27,7 @@ pub enum ImageEffect {
 
 // Rect represents a rectangular shape in `gg`.
 pub struct Rect {
-pub:
+pub mut:
 	x      f32
 	y      f32
 	width  f32