diff --git a/src/slic3r/GUI/OptionsGroup.cpp b/src/slic3r/GUI/OptionsGroup.cpp
index 4fe0e186eb..9f00fae9cb 100644
--- a/src/slic3r/GUI/OptionsGroup.cpp
+++ b/src/slic3r/GUI/OptionsGroup.cpp
@@ -4,6 +4,7 @@
 #include "GUI_App.hpp"
 #include "OG_CustomCtrl.hpp"
 #include "MsgDialog.hpp"
+#include "format.hpp"
 
 #include <utility>
 #include <wx/numformatter.h>