diff --git a/daemon/common.hpp b/daemon/common.hpp
index b5203c3..2e0ff22 100644
--- a/daemon/common.hpp
+++ b/daemon/common.hpp
@@ -32,6 +32,7 @@
 #include <boost/ref.hpp>
 #include <boost/asio.hpp>
 #include <boost/assert.hpp>
+#include <boost/functional/hash.hpp>
 
 #include <vector>
 #include <list>