diff --git a/src/unit_tests/serde/default_tokens_ext.rs b/src/unit_tests/serde/default_tokens_ext.rs
index 3d22a9e47..b3462f6e9 100644
--- a/src/unit_tests/serde/default_tokens_ext.rs
+++ b/src/unit_tests/serde/default_tokens_ext.rs
@@ -56,8 +56,10 @@ impl DefaultTokens for Subtitles {
         vec![
             Token::Struct {
                 name: "Subtitles",
-                len: 2,
+                len: 3,
             },
+            Token::Str("id"),
+            Token::Str(""),
             Token::Str("lang"),
             Token::Str(""),
             Token::Str("url"),
diff --git a/src/unit_tests/serde/subtitles.rs b/src/unit_tests/serde/subtitles.rs
index 576e8f0f1..a100d4c5a 100644
--- a/src/unit_tests/serde/subtitles.rs
+++ b/src/unit_tests/serde/subtitles.rs
@@ -6,14 +6,17 @@ use url::Url;
 fn subtitles() {
     assert_tokens(
         &Subtitles {
+            id: "id".to_owned(),
             lang: "lang".to_owned(),
             url: Url::parse("https://url").unwrap(),
         },
         &[
             Token::Struct {
                 name: "Subtitles",
-                len: 2,
+                len: 3,
             },
+            Token::Str("id"),
+            Token::Str("id"),
             Token::Str("lang"),
             Token::Str("lang"),
             Token::Str("url"),