diff --git a/src/slic3r/Utils/OctoPrint.cpp b/src/slic3r/Utils/OctoPrint.cpp
index d9448b62e..b084b6757 100644
--- a/src/slic3r/Utils/OctoPrint.cpp
+++ b/src/slic3r/Utils/OctoPrint.cpp
@@ -5,6 +5,7 @@
 #include <exception>
 #include <boost/format.hpp>
 #include <boost/log/trivial.hpp>
+#include <boost/nowide/convert.hpp>
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/json_parser.hpp>
 #include <boost/algorithm/string/predicate.hpp>