diff --git a/src/libslic3r/AppConfig.cpp b/src/libslic3r/AppConfig.cpp
index 59910e6..c35986c 100644
--- a/src/libslic3r/AppConfig.cpp
+++ b/src/libslic3r/AppConfig.cpp
@@ -1,6 +1,7 @@
 #include <boost/filesystem.hpp>
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/Utils.hpp"
+#include "libslic3r/I18N.hpp"
 #include "AppConfig.hpp"
 #include "Exception.hpp"
 #include "LocalesUtils.hpp"
