diff --git a/xs/src/libslic3r/ClipperUtils.hpp b/xs/src/libslic3r/ClipperUtils.hpp
index ab144f2..86331ac 100644
--- a/xs/src/libslic3r/ClipperUtils.hpp
+++ b/xs/src/libslic3r/ClipperUtils.hpp
@@ -2,7 +2,7 @@
 #define slic3r_ClipperUtils_hpp_
 
 #include <myinit.h>
-#include "clipper.hpp"
+#include <polyclipping/clipper.hpp>
 #include "ExPolygon.hpp"
 #include "Polygon.hpp"
 #include "Surface.hpp"
diff --git a/xs/src/libslic3r/Geometry.cpp b/xs/src/libslic3r/Geometry.cpp
index 827029a..e5b54bb 100644
--- 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 <cmath>
 #include <list>
diff --git a/xs/xsp/Clipper.xsp b/xs/xsp/Clipper.xsp
index d9530f7..3ba2448 100644
--- a/xs/xsp/Clipper.xsp
+++ b/xs/xsp/Clipper.xsp
@@ -2,7 +2,7 @@
 
 %{
 #include <myinit.h>
-#include "clipper.hpp"
+#include <polyclipping/clipper.hpp>
 #include "libslic3r/ClipperUtils.hpp"
 %}