diff --git a/src/python/storm-core.cpp b/src/python/storm-core.cpp
index 3d7b00404..b7ecebbd6 100644
--- a/src/python/storm-core.cpp
+++ b/src/python/storm-core.cpp
@@ -26,6 +26,7 @@ namespace boost { namespace python { namespace converter {
 
 
 std::shared_ptr<storm::models::ModelBase> buildModel(storm::prism::Program const& program, std::shared_ptr<storm::logic::Formula> const& formula) {
+    storm::settings::SettingsManager::manager().setFromString("");
     return storm::buildSymbolicModel<storm::RationalFunction>(program, std::vector<std::shared_ptr<storm::logic::Formula>>(1,formula)).model;
 }
 
@@ -45,6 +46,7 @@ BOOST_PYTHON_MODULE(_core)
     class_<storm::logic::ProbabilityOperatorFormula, std::shared_ptr<storm::logic::ProbabilityOperatorFormula>, bases<storm::logic::Formula>>("ProbabilityOperatorFormula", no_init)
         .def("toString", &storm::logic::ProbabilityOperatorFormula::toString);
 
+    register_ptr_to_python<std::shared_ptr<storm::logic::Formula>>();
 
     ////////////////////////////////////////////
     // Program
@@ -82,7 +84,9 @@ BOOST_PYTHON_MODULE(_core)
     class_<storm::models::sparse::Model<double>, std::shared_ptr<storm::models::sparse::Model<double>>, boost::noncopyable, bases<storm::models::ModelBase>>("SparseModel", no_init);
     class_<storm::models::sparse::Dtmc<storm::RationalFunction>, std::shared_ptr<storm::models::sparse::Dtmc<storm::RationalFunction>>, boost::noncopyable, bases<storm::models::ModelBase>>("SparseParamtricMc", no_init);
 
-
+    register_ptr_to_python<std::shared_ptr<storm::models::ModelBase>>();
+    register_ptr_to_python<std::shared_ptr<storm::models::sparse::Model<storm::RationalFunction>>>();
+    register_ptr_to_python<std::shared_ptr<storm::models::sparse::Dtmc<storm::RationalFunction>>>();
 
     def("parseFormulae", storm::parseFormulasForProgram);
     def("parseProgram", storm::parseProgram);
@@ -102,4 +106,4 @@ BOOST_PYTHON_MODULE(_core)
 
 
     def("performStateElimination", storm::verifySparseModel<storm::RationalFunction>);
-}
\ No newline at end of file
+}