diff --git a/kdbg/typetable.cpp b/kdbg/typetable.cpp
index f0aa7a9..007471b 100644
--- a/kdbg/typetable.cpp
+++ b/kdbg/typetable.cpp
@@ -11,6 +11,7 @@
 #include <ksimpleconfig.h>
 #include <list>
 #include <algorithm>
+#include <functional>
 #include <iterator>
 #ifdef HAVE_CONFIG_H
 #include "config.h"