diff --git a/fs/super.c b/fs/super.c
index c808183..fd427ec 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -190,6 +190,7 @@
 	s->s_flags = flags;
 	INIT_HLIST_NODE(&s->s_instances);
 	INIT_HLIST_BL_HEAD(&s->s_anon);
+	mutex_init(&s->s_sync_lock);
 	INIT_LIST_HEAD(&s->s_inodes);
 	spin_lock_init(&s->s_inode_list_lock);