diff --git a/libsrc/core/python_ngcore_export.cpp b/libsrc/core/python_ngcore_export.cpp
index d8666e6a..73bba40e 100644
--- a/libsrc/core/python_ngcore_export.cpp
+++ b/libsrc/core/python_ngcore_export.cpp
@@ -141,8 +141,10 @@ PYBIND11_MODULE(pyngcore, m) // NOLINT
 
     .def(py::self | py::self)
     .def(py::self & py::self)
-    .def(py::self |= py::self)
-    .def(py::self &= py::self)
+    // .def(py::self |= py::self)   // false clang warnings,
+    // .def(py::self &= py::self)   // see https://github.com/pybind/pybind11/issues/1893
+    .def("__ior__", [](BitArray& lhs, const BitArray& rhs) { return lhs |= rhs; }, py::is_operator())
+    .def("__iand__", [](BitArray& lhs, const BitArray& rhs) { return lhs &= rhs; }, py::is_operator())    
     .def(~py::self)
     ;
 
diff --git a/libsrc/geom2d/python_geom2d.cpp b/libsrc/geom2d/python_geom2d.cpp
index dc6ae29c..99ab617c 100644
--- a/libsrc/geom2d/python_geom2d.cpp
+++ b/libsrc/geom2d/python_geom2d.cpp
@@ -424,7 +424,8 @@ NGCORE_API_EXPORT void ExportGeom2d(py::module &m)
     .def(py::self-py::self)
     .def(py::self*py::self)
     .def(py::self+=py::self)
-    .def(py::self-=py::self)
+    // .def(py::self-=py::self) // false clange warning, see  https://github.com/pybind/pybind11/issues/1893
+    .def("__isub__", [](Solid2d& lhs, const Solid2d& rhs) { return lhs -= rhs; }, py::is_operator())
     .def(py::self*=py::self)
 
     .def("Mat", &Solid2d::Mat)