diff --git a/c_src/cmd_option.c b/c_src/cmd_option.c
index 1ae4e076..b40c2458 100644
--- a/c_src/cmd_option.c
+++ b/c_src/cmd_option.c
@@ -54,7 +54,7 @@ static int name_to_dev_idx(struct bch_fs *c, const char *dev)
 
 int cmd_set_option(int argc, char *argv[])
 {
-	struct bch_opt_strs new_opt_strs = bch2_cmdline_opts_get(&argc, argv, OPT_MOUNT|OPT_DEVICE);
+	struct bch_opt_strs new_opt_strs = bch2_cmdline_opts_get(&argc, argv, OPT_FS|OPT_DEVICE);
 	struct bch_opts new_opts = bch2_parse_opts(new_opt_strs);
 	DARRAY(unsigned) dev_idxs = {};
 	int opt, ret = 0;