diff --git a/tokenizers/src/tokenizer/added_vocabulary.rs b/tokenizers/src/tokenizer/added_vocabulary.rs
index 6053ee72..92235d55 100644
--- a/tokenizers/src/tokenizer/added_vocabulary.rs
+++ b/tokenizers/src/tokenizer/added_vocabulary.rs
@@ -85,8 +85,7 @@ impl Default for AddedToken {
         }
     }
 }
-// We only want to hash on the content. AddedToken cannot be added multiple times with different
-// options
+// AddedTokens can be updated if value changed
 impl std::hash::Hash for AddedToken {
     fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
         self.content.hash(state);
@@ -94,7 +93,7 @@ impl std::hash::Hash for AddedToken {
 }
 impl std::cmp::PartialEq for AddedToken {
     fn eq(&self, other: &Self) -> bool {
-        self.content == other.content
+        self.content == other.content && self.special == other.special && self.lstrip == other.lstrip && self.rstrip == other.rstrip && self.normalized == other.normalized && self.single_word == other.single_word
     }
 }
 impl std::cmp::Eq for AddedToken {}
@@ -665,13 +664,18 @@ mod tests {
         vocab.add_tokens(
             &[
                 AddedToken::from("tost", true),
-                AddedToken::from("another_two", true),
+                AddedToken::from("another_two", false),
             ],
             &model,
             normalizer,
         );
         assert_eq!(vocab.len(), 5); // New token was added
         assert_eq!(vocab.get_vocab()["another_two"], 4); // New token was added, but the index is not the length of the vocab
+
+        // Let's add an already added token again
+        assert_eq!(vocab.add_special_tokens(&[AddedToken::from("another_two", true)], &model, normalizer), 1);
+        assert_eq!(vocab.len(), 5); // Token was already there
+        assert_eq!(vocab.get_vocab()["another_two"], 4); // Token idx not changed
     }
 
     #[test]