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1diff --git a/libsrc/core/python_ngcore.hpp b/libsrc/core/python_ngcore.hpp
2index 2ce84481..4fc8aa4e 100644
3--- a/libsrc/core/python_ngcore.hpp
4+++ b/libsrc/core/python_ngcore.hpp
5@@ -2,6 +2,7 @@
6 #define NETGEN_CORE_PYTHON_NGCORE_HPP
7
8 #include "ngcore_api.hpp" // for operator new
9+#include <pybind11/embed.h>
10 #include <pybind11/pybind11.h>
11 #include <pybind11/operators.h>
12 #include <pybind11/numpy.h>
13diff --git a/ng/ngappinit.cpp b/ng/ngappinit.cpp
14index f6b4be0a..e21937b5 100644
15--- a/ng/ngappinit.cpp
16+++ b/ng/ngappinit.cpp
17@@ -256,6 +256,7 @@ int main(int argc, char ** argv)
18 Tk_MainLoop();
19 Tcl_DeleteInterp (myinterp);
20 #ifdef NETGEN_PYTHON
21+ py::scoped_interpreter guard{};
22 py::gil_scoped_acquire ensure_gil;
23 #endif
24