diff --git a/Include/cpython/object.h b/Include/cpython/object.h
index 4e6f86f29d8473..36ddc046d28880 100644
--- a/Include/cpython/object.h
+++ b/Include/cpython/object.h
@@ -442,7 +442,6 @@ PyAPI_FUNC(int) _Py_ReachedRecursionLimitWithMargin(PyThreadState *tstate, int m
 PyAPI_FUNC(void *) PyObject_GetItemData(PyObject *obj);
 
 PyAPI_FUNC(int) PyObject_VisitManagedDict(PyObject *obj, visitproc visit, void *arg);
-PyAPI_FUNC(int) _PyObject_SetManagedDict(PyObject *obj, PyObject *new_dict);
 PyAPI_FUNC(void) PyObject_ClearManagedDict(PyObject *obj);
 
 
diff --git a/Include/internal/pycore_object.h b/Include/internal/pycore_object.h
index 40f8ca68c00b72..5a76011072a7e9 100644
--- a/Include/internal/pycore_object.h
+++ b/Include/internal/pycore_object.h
@@ -1031,7 +1031,8 @@ enum _PyAnnotateFormat {
     _Py_ANNOTATE_FORMAT_STRING = 4,
 };
 
-int _PyObject_SetDict(PyObject *obj, PyObject *value);
+extern int _PyObject_SetDict(PyObject *obj, PyObject *value);
+extern int _PyObject_SetManagedDict(PyObject *obj, PyObject *new_dict);
 
 #ifndef Py_GIL_DISABLED
 static inline Py_ALWAYS_INLINE void _Py_INCREF_MORTAL(PyObject *op)