diff --git a/src/slic3r/GUI/NotificationManager.cpp b/src/slic3r/GUI/NotificationManager.cpp
index 72fd22b1a3..78969d7255 100644
--- a/src/slic3r/GUI/NotificationManager.cpp
+++ b/src/slic3r/GUI/NotificationManager.cpp
@@ -11,6 +11,7 @@
 #include <boost/algorithm/string.hpp>
 #include <boost/log/trivial.hpp>
 #include <boost/bind/placeholders.hpp>
+#include <boost/nowide/convert.hpp>
 
 #include <iostream>