diff --git a/src/mecab/src/dictionary.cpp b/src/mecab/src/dictionary.cpp
index a95053b..5717d4d 100644
--- a/src/mecab/src/dictionary.cpp
+++ b/src/mecab/src/dictionary.cpp
@@ -5,6 +5,7 @@
 //  Copyright(C) 2004-2006 Nippon Telegraph and Telephone Corporation
 #include <fstream>
 #include <climits>
+#include <functional>
 #include "connector.h"
 #include "context_id.h"
 #include "char_property.h"