diff --git a/libaxx/include/initializer_list b/libaxx/include/initializer_list
index dd7081dae..aadee9cbb 100644
--- a/libaxx/include/initializer_list
+++ b/libaxx/include/initializer_list
@@ -1,6 +1,8 @@
 #ifndef LIBAXX_INITIALIZER_LIST
 #define LIBAXX_INITIALIZER_LIST
 
+#include <stddef.h>
+
 namespace std {
 
 template<class T>