diff --git a/tstl/include/initializer_list.hpp b/tstl/include/initializer_list.hpp
index b0c8a48d..2dda61d6 100644
--- a/tstl/include/initializer_list.hpp
+++ b/tstl/include/initializer_list.hpp
@@ -8,6 +8,8 @@
 #ifndef INITIALIZER_LIST_H
 #define INITIALIZER_LIST_H
 
+#include <types.hpp>
+
 namespace std {
 
 template <typename T>