diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index fc0b6c46d6..67f7db55fc 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -31,6 +31,7 @@
 #include "GLCanvas3D.hpp"
 #include "Plater.hpp"
 #include "../Utils/Process.hpp"
+#include "format.hpp"
 
 #include <fstream>
 #include "GUI_App.hpp"