diff --git a/Include/AuroraEnum.hpp b/Include/AuroraEnum.hpp
index 41e55f7..717636b 100644
--- a/Include/AuroraEnum.hpp
+++ b/Include/AuroraEnum.hpp
@@ -20,6 +20,11 @@ using AuHashMap = std::unordered_map<T, Z>;
 using AuString = std::string;
 #endif
 
+#if !defined(AU_UInt)
+#define AU_UInt
+using AuUInt = size_t;
+#endif
+
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////////////////