diff --git a/bear-factory/bear-editor/src/bf/item_class_pool.hpp b/bear-factory/bear-editor/src/bf/item_class_pool.hpp
index 3e087e4..c19b241 100644
--- a/bear-factory/bear-editor/src/bf/item_class_pool.hpp
+++ b/bear-factory/bear-editor/src/bf/item_class_pool.hpp
@@ -15,6 +15,7 @@
 #define __BF_ITEM_CLASS_POOL_HPP__
 
 #include <boost/filesystem/convenience.hpp>
+#include <algorithm>
 #include <map>
 
 #include "bf/item_class.hpp"