diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 14aebcb3a..94e55ce5c 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -13,6 +13,7 @@
 #include "libslic3r/Model.hpp"
 #include "GLCanvas3D.hpp"
 #include "Selection.hpp"
+#include "format.hpp"
 
 #include <boost/algorithm/string.hpp>
 #include "slic3r/Utils/FixModelByWin10.hpp"