diff --git a/Include/internal/pycore_interp.h b/Include/internal/pycore_interp.h
@@ -182,7 +182,7 @@ struct _xidregitem {
PyAPI_FUNC(struct _is*) _PyInterpreterState_LookUpID(int64_t);

PyAPI_FUNC(int) _PyInterpreterState_IDInitref(struct _is *);
-PyAPI_FUNC(void) _PyInterpreterState_IDIncref(struct _is *);
PyAPI_FUNC(void) _PyInterpreterState_IDDecref(struct _is *);

#ifdef __cplusplus

diff --git a/Objects/interpreteridobject.c b/Objects/interpreteridobject.c
@@ -24,15 +24,21 @@ newinterpid(PyTypeObject *cls, int64_t id, int force)
        }
    }

    interpid *self = PyObject_New(interpid, cls);
    if (self == NULL) {
        return NULL;
    }
    self->id = id;

-    if (interp != NULL) {
-        _PyInterpreterState_IDIncref(interp);
-    }
    return self;
}


diff --git a/Python/pystate.c b/Python/pystate.c
@@ -493,24 +493,25 @@ _PyInterpreterState_IDInitref(PyInterpreterState *interp)
}


-void
_PyInterpreterState_IDIncref(PyInterpreterState *interp)
{
-    if (interp->id_mutex == NULL) {
-        return;
    }
    PyThread_acquire_lock(interp->id_mutex, WAIT_LOCK);
    interp->id_refcount += 1;
    PyThread_release_lock(interp->id_mutex);
}


void
_PyInterpreterState_IDDecref(PyInterpreterState *interp)
{
-    if (interp->id_mutex == NULL) {
-        return;
-    }
    struct _gilstate_runtime_state *gilstate = &_PyRuntime.gilstate;
    PyThread_acquire_lock(interp->id_mutex, WAIT_LOCK);
    assert(interp->id_refcount != 0);