--- a/xs/src/libslic3r/ClipperUtils.hpp
+++ b/xs/src/libslic3r/ClipperUtils.hpp
@@ -2,7 +2,7 @@
 #define slic3r_ClipperUtils_hpp_
 
 #include <libslic3r.h>
-#include "clipper.hpp"
+#include <polyclipping/clipper.hpp>
 #include "ExPolygon.hpp"
 #include "Polygon.hpp"
 #include "Surface.hpp"
--- a/xs/src/libslic3r/Geometry.cpp
+++ b/xs/src/libslic3r/Geometry.cpp
@@ -3,7 +3,7 @@
 #include "ExPolygon.hpp"
 #include "Line.hpp"
 #include "PolylineCollection.hpp"
-#include "clipper.hpp"
+#include <polyclipping/clipper.hpp>
 #include <algorithm>
 #include <cassert>
 #include <cmath>
--- a/xs/src/libslic3r/SVG.hpp
+++ b/xs/src/libslic3r/SVG.hpp
@@ -2,7 +2,7 @@
 #define slic3r_SVG_hpp_
 
 #include "libslic3r.h"
-#include "clipper.hpp"
+#include <polyclipping/clipper.hpp>
 #include "ExPolygon.hpp"
 #include "Line.hpp"
 #include "TriangleMesh.hpp"
--- a/xs/xsp/Clipper.xsp
+++ b/xs/xsp/Clipper.xsp
@@ -2,7 +2,7 @@
 
 %{
 #include <xsinit.h>
-#include "clipper.hpp"
+#include <polyclipping/clipper.hpp>
 #include "libslic3r/ClipperUtils.hpp"
 %}