diff --git a/src/ifcgeom/IfcGeomRepresentation.cpp b/src/ifcgeom/IfcGeomRepresentation.cpp
index 1c6e31813a..54ec30ea7f 100644
--- a/src/ifcgeom/IfcGeomRepresentation.cpp
+++ b/src/ifcgeom/IfcGeomRepresentation.cpp
@@ -423,3 +423,11 @@ const IfcGeom::ConversionResultShape* IfcGeom::Representation::BRep::item(int i)
 		return nullptr;
 	}
 }
+
+int IfcGeom::Representation::BRep::item_id(int i) const {
+	if (i >= 0 && i < shapes_.size()) {
+		return shapes_[i].ItemId();
+	} else {
+		return 0;
+	}
+}
diff --git a/src/ifcgeom/IfcGeomRepresentation.h b/src/ifcgeom/IfcGeomRepresentation.h
index d071cfcce7..5cfd3d0bc2 100644
--- a/src/ifcgeom/IfcGeomRepresentation.h
+++ b/src/ifcgeom/IfcGeomRepresentation.h
@@ -72,6 +72,7 @@ namespace IfcGeom {
 
 			int size() const { return shapes_.size(); }
 			const IfcGeom::ConversionResultShape* item(int i) const;
+			int item_id(int i) const;
 		};
 
 		class IFC_GEOM_API Serialization : public Representation  {