diff --git a/internal/graphicsutil/vertices.go b/internal/graphicsutil/vertices.go
index d5414d987..ec8ee04a4 100644
--- a/internal/graphicsutil/vertices.go
+++ b/internal/graphicsutil/vertices.go
@@ -73,11 +73,11 @@ func QuadVertices(width, height int, sx0, sy0, sx1, sy1 int, geom GeoM) []float3
 	wf := float32(w)
 	hf := float32(h)
 	u0, v0, u1, v1 := float32(sx0)/wf, float32(sy0)/hf, float32(sx1)/wf, float32(sy1)/hf
-	quadVerticesImpl(vs, wf, hf, u0, v0, u1, v1, x0, y0, x1, y1, geom)
+	quadVerticesImpl(vs, u0, v0, u1, v1, x0, y0, x1, y1, geom)
 	return vs
 }
 
-func quadVerticesImpl(vs []float32, wf, hf, u0, v0, u1, v1, x0, y0, x1, y1 float32, geom GeoM) {
+func quadVerticesImpl(vs []float32, u0, v0, u1, v1, x0, y0, x1, y1 float32, geom GeoM) {
 	x, y := geom.Apply(x0, y0)
 	// Vertex coordinates
 	vs[0] = x