diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index 17e3ac68c..ed887d062 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -25,6 +25,7 @@
 #include <boost/algorithm/string/split.hpp>
 #endif // ENABLE_GCODE_WINDOW
 #include <boost/nowide/cstdio.hpp>
+#include <boost/nowide/fstream.hpp>
 #include <wx/progdlg.h>
 #include <wx/numformatter.h>