diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index 5bfe51a47..2397a17ff 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -2,6 +2,7 @@
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/Print.hpp"
 #include "libslic3r/LocalesUtils.hpp"
+#include "libslic3r/format.hpp"
 #include "GCodeProcessor.hpp"
 
 #include <boost/log/trivial.hpp>