diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 47da80b6c..5c7370e0b 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -10,6 +10,7 @@
 #include "ShortestPath.hpp"
 #include "Print.hpp"
 #include "Utils.hpp"
+#include "ClipperUtils.hpp"
 #include "libslic3r.h"
 
 #include <algorithm>