diff --git a/src/service_account.rs b/src/service_account.rs
index 81d4c6e..933811d 100644
--- a/src/service_account.rs
+++ b/src/service_account.rs
@@ -92,6 +92,7 @@ struct Claims<'a> {
     aud: &'a str,
     exp: i64,
     iat: i64,
+    #[serde(rename = "sub")]
     subject: Option<&'a str>,
     scope: String,
 }