diff --git a/src/python/nucleus/export_nuclei.cpp b/src/python/nucleus/export_nuclei.cpp
index 85517b5a6..7fec3b2f7 100644
--- a/src/python/nucleus/export_nuclei.cpp
+++ b/src/python/nucleus/export_nuclei.cpp
@@ -60,17 +60,23 @@ void export_nuclei(python_module_reference m) {
     };
     //}
 
+    pybind11::keep_alive<0, 1> ka;
+
     python_class_type<nuclei_type>(m, "Nuclei")
       .def(pybind11::init<>())
       .def(pybind11::init(list_ctor))
-      .def_property("charges", get_charges_fxn, set_charges_fxn)
+      .def_property(
+        "charges",
+        pybind11::cpp_function(
+          get_charges_fxn, pybind11::return_value_policy::take_ownership, ka),
+        pybind11::cpp_function(set_charges_fxn))
       .def("empty", [](nuclei_reference self) { return self.empty(); })
       .def("push_back", push_back)
       .def("at", [](nuclei_reference self, size_type i) { return self[i]; })
       .def("size", [](nuclei_reference self) { return self.size(); })
       .def("__repr__", str_fxn)
       .def("__str__", str_fxn)
-      .def("__iter__", iter_fxn, pybind11::keep_alive<0, 1>())
+      .def("__iter__", iter_fxn, ka)
       .def(pybind11::self == pybind11::self)
       .def(pybind11::self != pybind11::self);
 }
diff --git a/src/python/point_charge/export_charges_view.cpp b/src/python/point_charge/export_charges_view.cpp
index e05f547ce..e855d02c1 100644
--- a/src/python/point_charge/export_charges_view.cpp
+++ b/src/python/point_charge/export_charges_view.cpp
@@ -30,20 +30,27 @@ void export_charges_view_(const char* name, python_module_reference m) {
     using size_type           = typename view_type::size_type;
     using point_set_reference = typename view_type::point_set_reference;
 
+    auto get_point_set_fxn = [](reference self) { return self.point_set(); };
+    auto set_point_set_fxn = [](reference self, point_set_reference points) {
+        self.point_set() = points;
+    };
+
     auto str_fxn = [](const view_type& charges) {
         std::ostringstream stream;
         stream << charges;
         return stream.str();
     };
 
+    pybind11::keep_alive<0, 1> ka;
+
     python_class_type<view_type>(m, name)
       .def(pybind11::init<>())
       .def(pybind11::init<charges_type&>())
       .def_property(
-        "point_set", [](reference self) { return self.point_set(); },
-        [](reference self, point_set_reference points) {
-            self.point_set() = points;
-        })
+        "point_set",
+        pybind11::cpp_function(
+          get_point_set_fxn, pybind11::return_value_policy::take_ownership, ka),
+        pybind11::cpp_function(set_point_set_fxn))
       .def("empty", [](reference self) { return self.empty(); })
       .def("at", [](reference self, size_type i) { return self[i]; })
       .def("size", [](reference self) { return self.size(); })