diff --git a/src/libslic3r/ElephantFootCompensation.hpp b/src/libslic3r/ElephantFootCompensation.hpp
index beb17d10b..596a3e958 100644
--- a/src/libslic3r/ElephantFootCompensation.hpp
+++ b/src/libslic3r/ElephantFootCompensation.hpp
@@ -2,6 +2,7 @@
 #define slic3r_ElephantFootCompensation_hpp_
 
 #include "libslic3r.h"
+#include "ExPolygon.hpp"
 #include <vector>
 
 namespace Slic3r {
diff --git a/src/libslic3r/PrintObjectSlice.cpp b/src/libslic3r/PrintObjectSlice.cpp
index 1499e1c70..b46ef36b1 100644
--- a/src/libslic3r/PrintObjectSlice.cpp
+++ b/src/libslic3r/PrintObjectSlice.cpp
@@ -3,6 +3,7 @@
 #include "Layer.hpp"
 #include "MultiMaterialSegmentation.hpp"
 #include "Print.hpp"
+#include "ClipperUtils.hpp"
 
 #include <boost/log/trivial.hpp>