diff --git a/src/libslic3r/ExtrusionEntity.hpp b/src/libslic3r/ExtrusionEntity.hpp
index 773818010..050ab2ed6 100644
--- a/src/libslic3r/ExtrusionEntity.hpp
+++ b/src/libslic3r/ExtrusionEntity.hpp
@@ -2,6 +2,7 @@
 #define slic3r_ExtrusionEntity_hpp_
 
 #include "libslic3r.h"
+#include "BoundingBox.hpp"
 #include "Polygon.hpp"
 #include "Polyline.hpp"