--- a/src/slic3r/GUI/UserAccountCommunication.cpp
+++ b/src/slic3r/GUI/UserAccountCommunication.cpp
@@ -9,6 +9,7 @@
 #include <boost/log/trivial.hpp>
 #include <boost/beast/core/detail/base64.hpp>
 #include <boost/algorithm/string.hpp>
+#include <boost/nowide/convert.hpp>
 #include <curl/curl.h>
 #include <string>
 
