diff --git a/src/ifcgeom/kernels/opencascade/IfcGeomTree.h b/src/ifcgeom/kernels/opencascade/IfcGeomTree.h
index 29b4bcec01..95826db674 100644
--- a/src/ifcgeom/kernels/opencascade/IfcGeomTree.h
+++ b/src/ifcgeom/kernels/opencascade/IfcGeomTree.h
@@ -270,7 +270,7 @@ namespace IfcGeom {
 			std::vector<T> select(const IfcGeom::BRepElement* elem, bool completely_within = false, double extend = -1.e-5) const {
 				auto shp = elem->geometry().as_compound();
 				auto compound = ((OpenCascadeShape*)shp)->shape();
-				const auto& m = elem->transformation().data().ccomponents();
+				const auto& m = elem->transformation().data()->ccomponents();
 				gp_Trsf tr;
 				tr.SetValues(
 					m(0, 0), m(0, 1), m(0, 2), m(0, 3),
diff --git a/src/ifcgeom/taxonomy.h b/src/ifcgeom/taxonomy.h
index 042151f509..92dfcf9b75 100644
--- a/src/ifcgeom/taxonomy.h
+++ b/src/ifcgeom/taxonomy.h
@@ -697,7 +697,7 @@ struct collection_base : public geom_item {
 struct collection : public collection_base<geom_item> {
 	DECLARE_PTR(collection)
 
-	virtual collection_base* clone_() const { return new collection(*this); }
+	virtual collection* clone_() const { return new collection(*this); }
 	virtual kinds kind() const { return COLLECTION; }
 
 	virtual size_t calc_hash() const {