diff --git a/include/sqlpp11/hidden.h b/include/sqlpp11/hidden.h
index 81ef18c9..76861ee2 100644
--- a/include/sqlpp11/hidden.h
+++ b/include/sqlpp11/hidden.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2015, Roland Bock
+ * Copyright (c) 2013-2017, Roland Bock
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification,
@@ -27,6 +27,8 @@
 #ifndef SQLPP_HIDDEN_H
 #define SQLPP_HIDDEN_H
 
+#include <sqlpp11/serializer.h>
+
 namespace sqlpp
 {
   template <typename Clause>