diff --git a/bindings/python/src/token.rs b/bindings/python/src/token.rs
index 86e926028..72481c368 100644
--- a/bindings/python/src/token.rs
+++ b/bindings/python/src/token.rs
@@ -1,7 +1,7 @@
 use pyo3::prelude::*;
 use tk::Token;
 
-#[pyclass(module = "tokenizers", name = "Token")]
+#[pyclass(module = "tokenizers", name = "Token", frozen)]
 #[derive(Clone)]
 pub struct PyToken {
     token: Token,
diff --git a/bindings/python/src/utils/regex.rs b/bindings/python/src/utils/regex.rs
index 16f706820..fafba844f 100644
--- a/bindings/python/src/utils/regex.rs
+++ b/bindings/python/src/utils/regex.rs
@@ -3,7 +3,7 @@ use pyo3::prelude::*;
 use tk::utils::SysRegex;
 
 /// Instantiate a new Regex with the given pattern
-#[pyclass(module = "tokenizers", name = "Regex")]
+#[pyclass(module = "tokenizers", name = "Regex", frozen)]
 pub struct PyRegex {
     pub inner: SysRegex,
     pub pattern: String,