diff --git a/src/generator/codegen_register.rs b/src/generator/codegen_register.rs
index 73d9c0d..dcce736 100644
--- a/src/generator/codegen_register.rs
+++ b/src/generator/codegen_register.rs
@@ -79,7 +79,7 @@ fn reg_type_def_masked(
             type Error = DataConversionError<#type_ux, Self>;
 
             fn try_from(value: #type_ux) -> Result<Self, Self::Error> {
-                Ok(SlId(value & #mask))
+                Ok(Self(value & #mask))
             }
         }
         impl From<#upper_camel_name> for #type_ux {