diff --git a/xs/src/libslic3r/ClipperUtils.hpp b/xs/src/libslic3r/ClipperUtils.hpp
index 2ab3ff7..2058f82 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 8e08336..606a8e7 100644
--- a/xs/src/libslic3r/Geometry.cpp
+++ b/xs/src/libslic3r/Geometry.cpp
@@ -1,7 +1,7 @@
 #include "Geometry.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 43a30a4..263c808 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"
 %}