diff --git a/src/ifcgeom/kernels/opencascade/IfcGeomTree.h b/src/ifcgeom/kernels/opencascade/IfcGeomTree.h
index b58b72b186..8c573f75f9 100644
--- a/src/ifcgeom/kernels/opencascade/IfcGeomTree.h
+++ b/src/ifcgeom/kernels/opencascade/IfcGeomTree.h
@@ -1933,6 +1933,7 @@ namespace IfcGeom {
             normals_[t] = std::move(normals);
             aabbs_[t] = aabb;
             obbs_[t] = obb;
+            max_protrusions_[t] = std::min(std::min(obb.XHSize(), obb.YHSize()), obb.ZHSize()) * 2;
         }
         
 		void add_element(IfcGeom::BRepElement* elem) {