diff --git a/src/interfaces/statsfm/album.ts b/src/interfaces/statsfm/album.ts
index 287cc8b..c87501c 100644
--- a/src/interfaces/statsfm/album.ts
+++ b/src/interfaces/statsfm/album.ts
@@ -7,14 +7,14 @@ export const AlbumReleaseType = {
   ALBUM: 'ALBUM',
   COMPILATION: 'COMPILATION',
   EP: 'EP'
-};
+} as const;
 
 export type AlbumReleaseType = (typeof AlbumReleaseType)[keyof typeof AlbumReleaseType];
 
 export const AlbumReleaseImageSource = {
   SPOTIFY: 'SPOTIFY',
   APPLEMUSIC: 'APPLEMUSIC'
-};
+} as const;
 
 export type AlbumReleaseImageSource =
   (typeof AlbumReleaseImageSource)[keyof typeof AlbumReleaseImageSource];
diff --git a/src/interfaces/statsfm/artist.ts b/src/interfaces/statsfm/artist.ts
index aac2740..4f686b5 100644
--- a/src/interfaces/statsfm/artist.ts
+++ b/src/interfaces/statsfm/artist.ts
@@ -4,7 +4,7 @@ import { TopObject } from './top';
 export const ArtistImageSource = {
   SPOTIFY: 'SPOTIFY',
   APPLEMUSIC: 'APPLEMUSIC'
-};
+} as const;
 
 export type ArtistImageSource = (typeof ArtistImageSource)[keyof typeof ArtistImageSource];