diff --git a/src/types/custom_types.rs b/src/types/custom_types.rs
index cbed43a3..14157e39 100644
--- a/src/types/custom_types.rs
+++ b/src/types/custom_types.rs
@@ -41,7 +41,7 @@ impl CustomTypesCollection {
     }
     /// Register a custom type.
     #[inline(always)]
-    pub fn add_type<T>(&mut self, name: impl Into<Identifier>) {
+    pub fn add_type<T>(&mut self, name: &str) {
         self.add_raw(
             type_name::<T>(),
             CustomTypeInfo {