diff --git a/main.go b/main.go
index e5f54a7..2416d48 100644
--- a/main.go
+++ b/main.go
@@ -37,8 +37,10 @@ type UgoiraManifest struct {
 
 type PostId uint64
 
-const ArtworkUrlTemplate = "https://www.pixiv.net/en/artworks/%d"
-const ManifestUrlTemplate = "https://www.pixiv.net/ajax/illust/%d/ugoira_meta"
+const (
+	ArtworkUrlTemplate = "https://www.pixiv.net/en/artworks/%d"
+	ManifestUrlTemplate = "https://www.pixiv.net/ajax/illust/%d/ugoira_meta"
+)
 
 func doPixivRequest(client *http.Client, url, referer, userAgent string) io.ReadCloser {
 	req, err := http.NewRequest("GET", url, nil)