diff --git a/src/validator.rs b/src/validator.rs
index 17a379e..74aa4c3 100644
--- a/src/validator.rs
+++ b/src/validator.rs
@@ -16,7 +16,7 @@ pub struct FlattenedRegisterEntry<'a> {
 }
 
 /// Flattened register map.
-type FlattenedRegisterMap<'a> = Vec<Option<FlattenedRegisterEntry<'a>>>;
+pub type FlattenedRegisterMap<'a> = Vec<Option<FlattenedRegisterEntry<'a>>>;
 
 impl Module {
     /// Validate the address assignment, generating a flatten register map.