diff --git a/libsrc/occ/python_occ_shapes.cpp b/libsrc/occ/python_occ_shapes.cpp
index 91e94c50..cbb35178 100644
--- a/libsrc/occ/python_occ_shapes.cpp
+++ b/libsrc/occ/python_occ_shapes.cpp
@@ -194,6 +194,7 @@ py::object CastShape(const TopoDS_Shape & s)
     case TopAbs_SHAPE:
       return py::cast(s);
     }
+    throw Exception("Invalid Shape type");
 };