diff --git a/include/cpprealm/internal/bridge/realm.hpp b/include/cpprealm/internal/bridge/realm.hpp
index c7220b12..9f46b5d1 100644
--- a/include/cpprealm/internal/bridge/realm.hpp
+++ b/include/cpprealm/internal/bridge/realm.hpp
@@ -21,6 +21,7 @@
 
 #include <cpprealm/internal/bridge/utils.hpp>
 
+#include <cstdint>
 #include <functional>
 #include <map>
 #include <memory>