diff --git a/src/libslic3r/ElephantFootCompensation.cpp b/src/libslic3r/ElephantFootCompensation.cpp
index b23854f11..5bdeaa954 100644
--- a/src/libslic3r/ElephantFootCompensation.cpp
+++ b/src/libslic3r/ElephantFootCompensation.cpp
@@ -1,6 +1,7 @@
 #include "clipper/clipper_z.hpp"
 
 #include "libslic3r.h"
+#include "ClipperUtils.hpp"
 #include "EdgeGrid.hpp"
 #include "ExPolygon.hpp"
 #include "ElephantFootCompensation.hpp"