diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 675b389cba5b1307ad637ff6d8e93dbca78eb315..9cc4a3fbf4b0d4ab3106b7584ba756776005e6f8 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -707,6 +707,7 @@ static int nfs_idmap_legacy_upcall(struct key_construction *cons,
 	msg = &data->pipe_msg;
 	im = &data->idmap_msg;
 	data->idmap = idmap;
+	data->key_cons = cons;
 
 	ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
 	if (ret < 0)