diff --git a/src/slic3r/GUI/MainFrame.hpp b/src/slic3r/GUI/MainFrame.hpp
index a5d3a1f6d..a8b2be2bc 100644
--- a/src/slic3r/GUI/MainFrame.hpp
+++ b/src/slic3r/GUI/MainFrame.hpp
@@ -4,6 +4,7 @@
 #include "libslic3r/PrintConfig.hpp"
 
 #include <wx/frame.h>
+#include <wx/settings.h>
 #include <wx/string.h>
 
 #include <string>