diff --git a/image.go b/image.go
index 2a44381eb..42a2f9558 100644
--- a/image.go
+++ b/image.go
@@ -454,9 +454,7 @@ func (i *Image) ReplacePixels(p []byte) error {
 		panic(fmt.Sprintf("ebiten: len(p) was %d but must be %d", len(p), l))
 	}
 
-	px := make([]byte, len(p))
-	copy(px, p)
-	i.mipmap.replacePixels(px)
+	i.mipmap.replacePixels(p)
 	return nil
 }