diff --git a/graphicscontext.go b/graphicscontext.go
index b71dc305e..2671ed893 100644
--- a/graphicscontext.go
+++ b/graphicscontext.go
@@ -54,15 +54,13 @@ func (c *graphicsContext) SetSize(screenWidth, screenHeight int, screenScale flo
 	if c.offscreen != nil {
 		_ = c.offscreen.Dispose()
 	}
-	offscreen := newVolatileImage(screenWidth, screenHeight, FilterDefault)
+	c.offscreen = newVolatileImage(screenWidth, screenHeight, FilterDefault)
 
 	w := int(float64(screenWidth) * screenScale)
 	h := int(float64(screenHeight) * screenScale)
 	px0, py0, _, _ := ui.ScreenPadding()
 	c.screen = newImageWithScreenFramebuffer(w, h)
 
-	c.offscreen = offscreen
-
 	c.offsetX = px0
 	c.offsetY = py0
 }