diff --git a/src/libslic3r/PolygonTrimmer.hpp b/src/libslic3r/PolygonTrimmer.hpp
index b2a780be9..eddffbc7f 100644
--- a/src/libslic3r/PolygonTrimmer.hpp
+++ b/src/libslic3r/PolygonTrimmer.hpp
@@ -7,6 +7,7 @@
 #include "Line.hpp"
 #include "MultiPoint.hpp"
 #include "Polyline.hpp"
+#include "Polygon.hpp"
 
 namespace Slic3r {