diff --git a/internal/restorable/image.go b/internal/restorable/image.go
index 8b6788fb8..1059a5270 100644
--- a/internal/restorable/image.go
+++ b/internal/restorable/image.go
@@ -148,7 +148,7 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 		geom := (*affine.GeoM)(nil).Scale(float64(width)/float64(w), float64(height)/float64(h))
 		geom = geom.Translate(float64(x), float64(y))
 		colorm := (*affine.ColorM)(nil).Scale(0, 0, 0, 0)
-		vs := vertices(w, h, 0, 0, w, h, geom)
+		vs := quadVertices(w, h, 0, 0, w, h, geom)
 		i.image.DrawImage(dummyImage.image, vs, quadIndices, colorm, opengl.CompositeModeCopy, graphics.FilterNearest)
 	}
 
@@ -188,7 +188,7 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 // DrawImage draws a given image img to the image.
 func (i *Image) DrawImage(img *Image, sx0, sy0, sx1, sy1 int, geom *affine.GeoM, colorm *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
 	w, h := img.Size()
-	vs := vertices(w, h, sx0, sy0, sx1, sy1, geom)
+	vs := quadVertices(w, h, sx0, sy0, sx1, sy1, geom)
 	if vs == nil {
 		return
 	}
diff --git a/internal/restorable/vertices.go b/internal/restorable/vertices.go
index 136240c58..d8870cc4e 100644
--- a/internal/restorable/vertices.go
+++ b/internal/restorable/vertices.go
@@ -44,7 +44,7 @@ func (v *verticesBackend) sliceForOneQuad() []float32 {
 	return s
 }
 
-func vertices(width, height int, sx0, sy0, sx1, sy1 int, geo *affine.GeoM) []float32 {
+func quadVertices(width, height int, sx0, sy0, sx1, sy1 int, geo *affine.GeoM) []float32 {
 	if sx0 >= sx1 || sy0 >= sy1 {
 		return nil
 	}