diff --git a/tokenizers/src/normalizers/byte_level.rs b/tokenizers/src/normalizers/byte_level.rs
index 42c7fa510..9d52f7eaa 100644
--- a/tokenizers/src/normalizers/byte_level.rs
+++ b/tokenizers/src/normalizers/byte_level.rs
@@ -2,10 +2,11 @@ use crate::processors::byte_level::bytes_char;
 use crate::tokenizer::{NormalizedString, Normalizer, Result};
 use serde::{Deserialize, Serialize};
 use std::collections::{HashMap, HashSet};
+use crate::utils::macro_rules_attribute;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
-#[serde(tag = "type")]
-pub struct ByteLevel {}
+#[derive(Clone, Debug)]
+#[macro_rules_attribute(impl_serde_type!)]
+pub struct ByteLevel;
 
 lazy_static! {
     static ref BYTES_CHAR: HashMap<u8, char> = bytes_char();
diff --git a/tokenizers/src/normalizers/mod.rs b/tokenizers/src/normalizers/mod.rs
index c5144be14..43f50bfda 100644
--- a/tokenizers/src/normalizers/mod.rs
+++ b/tokenizers/src/normalizers/mod.rs
@@ -73,3 +73,36 @@ impl_enum_from!(Precompiled, NormalizerWrapper, Precompiled);
 impl_enum_from!(Replace, NormalizerWrapper, Replace);
 impl_enum_from!(Prepend, NormalizerWrapper, Prepend);
 impl_enum_from!(ByteLevel, NormalizerWrapper, ByteLevel);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+        fn post_processor_deserialization_no_type() {
+            let json = r#"{"strip_left":false, "strip_right":true}"#;
+            let reconstructed = serde_json::from_str::<NormalizerWrapper>(json);
+            assert!(matches!(
+                reconstructed.unwrap(),
+                NormalizerWrapper::StripNormalizer(_)
+            ));
+
+            let json =
+                r#"{"sep":["</s>",2], "cls":["<s>",0], "trim_offsets":true, "add_prefix_space":true}"#;
+            let reconstructed = serde_json::from_str::<NormalizerWrapper>(json).unwrap();
+            println!("{:?}", reconstructed);
+            assert!(matches!(
+                reconstructed,
+                NormalizerWrapper::Sequence(_)
+            ));
+
+            let json = r#"{"type":"RobertaProcessing", "sep":["</s>",2] }"#;
+            let reconstructed = serde_json::from_str::<NormalizerWrapper>(json);
+            match reconstructed {
+                Err(err) => assert_eq!(
+                    err.to_string(),
+                    "data did not match any variant of untagged enum NormalizerWrapper"
+                ),
+                _ => panic!("Expected an error here"),
+            }
+        }
+    }
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