diff --git a/src/openrct2/core/Identifier.hpp b/src/openrct2/core/Identifier.hpp
index a08156e498..e93f8f17ae 100644
--- a/src/openrct2/core/Identifier.hpp
+++ b/src/openrct2/core/Identifier.hpp
@@ -32,6 +32,8 @@ private:
     }
 
 public:
+    using UnderlyingType = T;
+
     constexpr TIdentifier() = default;
 
     static constexpr TIdentifier GetNull() noexcept