diff --git a/include/cpprealm/internal/bridge/realm.hpp b/include/cpprealm/internal/bridge/realm.hpp
index 38703d1..827c71d 100644
--- a/include/cpprealm/internal/bridge/realm.hpp
+++ b/include/cpprealm/internal/bridge/realm.hpp
@@ -27,6 +27,7 @@
 #include <optional>
 #include <string>
 #include <vector>
+#include <cstdint>
 
 namespace realm {
     class Realm;