diff --git a/Include/cpython/ceval.h b/Include/cpython/ceval.h
index 7459937..020f787 100644
--- a/Include/cpython/ceval.h
+++ b/Include/cpython/ceval.h
@@ -11,9 +11,9 @@
 PyAPI_FUNC(void) PyEval_SetTrace(Py_tracefunc, PyObject *);
 PyAPI_FUNC(int) _PyEval_SetTrace(PyThreadState *tstate, Py_tracefunc func, PyObject *arg);
 PyAPI_FUNC(int) _PyEval_GetCoroutineOriginTrackingDepth(void);
-PyAPI_FUNC(void) _PyEval_SetAsyncGenFirstiter(PyObject *);
+PyAPI_FUNC(int) _PyEval_SetAsyncGenFirstiter(PyObject *);
 PyAPI_FUNC(PyObject *) _PyEval_GetAsyncGenFirstiter(void);
-PyAPI_FUNC(void) _PyEval_SetAsyncGenFinalizer(PyObject *);
+PyAPI_FUNC(int) _PyEval_SetAsyncGenFinalizer(PyObject *);
 PyAPI_FUNC(PyObject *) _PyEval_GetAsyncGenFinalizer(void);
 
 /* Helper to look up a builtin object */