diff --git a/libbcachefs.c b/libbcachefs.c
index bac772b2..44a5fbf3 100644
--- a/libbcachefs.c
+++ b/libbcachefs.c
@@ -193,7 +193,7 @@ struct bch_sb *bch2_format(struct bch_opt_strs	fs_opt_strs,
 	sb.sb->nr_devices	= nr_devs;
 
 	if (opts.version == bcachefs_metadata_version_current)
-		sb.sb->features[0] |= BCH_SB_FEATURES_ALL;
+		sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
 
 	uuid_generate(sb.sb->uuid.b);