--- a/src/slic3r/GUI/UserAccountCommunication.cpp
+++ b/src/slic3r/GUI/UserAccountCommunication.cpp
@@ -13,6 +13,7 @@
 #include <boost/filesystem.hpp>
 #include <boost/nowide/cstdio.hpp>
 #include <boost/nowide/fstream.hpp>
+#include <boost/nowide/convert.hpp>
 #include <curl/curl.h>
 #include <string>