diff --git a/rauthy-models/src/lib.rs b/rauthy-models/src/lib.rs
index 4cdf1330..b11d02ac 100644
--- a/rauthy-models/src/lib.rs
+++ b/rauthy-models/src/lib.rs
@@ -105,6 +105,7 @@ pub struct JwtAccessClaims {
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct JwtIdClaims {
+    pub sub: String,
     pub azp: String,
     pub typ: JwtType,
     pub amr: Vec<String>,
diff --git a/rauthy-service/src/auth.rs b/rauthy-service/src/auth.rs
index 7cd8e96f..4a78b587 100644
--- a/rauthy-service/src/auth.rs
+++ b/rauthy-service/src/auth.rs
@@ -386,6 +386,7 @@ pub async fn build_id_token(
     };
 
     let mut custom_claims = JwtIdClaims {
+        sub: user.id.clone(),
         azp: client.id.clone(),
         typ: JwtType::Id,
         amr: vec![amr],