diff --git a/c/call_python.c b/c/call_python.c
index d3d2e17..d291eb3 100644
--- a/c/call_python.c
+++ b/c/call_python.c
@@ -1,8 +1,10 @@
 #if PY_VERSION_HEX >= 0x03080000
-# define HAVE_PYINTERPSTATE_GETDICT
+# define Py_BUILD_CORE
+/* for access to the fields of PyInterpreterState */
+#  include "internal/pycore_pystate.h"
+# undef Py_BUILD_CORE
 #endif
 
-
 static PyObject *_current_interp_key(void)
 {
     PyInterpreterState *interp = PyThreadState_GET()->interp;
-- 
2.23.0