diff --git a/src/models/Track.ts b/src/models/Track.ts
index dc83239..9d977b2 100644
--- a/src/models/Track.ts
+++ b/src/models/Track.ts
@@ -22,5 +22,5 @@ export class Track {
   @Column()
   @IsInt()
   @IsPositive()
-  length: string;
+  length: number;
 }