diff --git a/src/entt/entity/group.hpp b/src/entt/entity/group.hpp
index 13ff4b4de..6ce739e80 100644
--- a/src/entt/entity/group.hpp
+++ b/src/entt/entity/group.hpp
@@ -2,6 +2,8 @@
 #define ENTT_ENTITY_GROUP_HPP
 
 #include <array>
+#include <cstddef>
+#include <iterator>
 #include <tuple>
 #include <type_traits>
 #include <utility>