diff --git a/tduck-account/src/main/java/com/tduck/cloud/account/util/JwtUtils.java b/tduck-account/src/main/java/com/tduck/cloud/account/util/JwtUtils.java
index 9d65251..6bcfec0 100644
--- a/tduck-account/src/main/java/com/tduck/cloud/account/util/JwtUtils.java
+++ b/tduck-account/src/main/java/com/tduck/cloud/account/util/JwtUtils.java
@@ -33,7 +33,7 @@ public class JwtUtils {
 
         return Jwts.builder()
                 .setHeaderParam("typ", "JWT")
-                .setSubject(userId + "")
+                .setSubject(userId)
                 .setIssuedAt(nowDate)
                 .setExpiration(expireDate)
                 .signWith(SignatureAlgorithm.HS512, secret)