diff --git a/module/bdev/rbd/bdev_rbd_rpc.c b/module/bdev/rbd/bdev_rbd_rpc.c
index acc16e845..cc07fffcb 100644
--- a/module/bdev/rbd/bdev_rbd_rpc.c
+++ b/module/bdev/rbd/bdev_rbd_rpc.c
@@ -275,7 +275,7 @@ static const struct spdk_json_object_decoder rpc_register_cluster_decoders[] = {
 	{"name", offsetof(struct cluster_register_info, name), spdk_json_decode_string, true},
 	{"user_id", offsetof(struct cluster_register_info, user_id), spdk_json_decode_string, true},
 	{"config_param", offsetof(struct cluster_register_info, config_param), bdev_rbd_decode_config, true},
-	{"config_file", offsetof(struct cluster_register_info, config_file), bdev_rbd_decode_config, true}
+	{"config_file", offsetof(struct cluster_register_info, config_file), spdk_json_decode_string, true}
 };
 
 static void