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-rw-r--r--btrfs-convert.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/btrfs-convert.c b/btrfs-convert.c
index f9910dc8..2977533a 100644
--- a/btrfs-convert.c
+++ b/btrfs-convert.c
@@ -2441,7 +2441,7 @@ static int do_rollback(const char *devname)
ext2_root = btrfs_read_fs_root(root->fs_info, &key);
if (!ext2_root || IS_ERR(ext2_root)) {
fprintf(stderr, "unable to open subvol %llu\n",
- key.objectid);
+ (unsigned long long)key.objectid);
goto fail;
}