diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 888a145..1aecd62 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -2100,6 +2100,8 @@
 	spin_lock_init(&osb->osb_xattr_lock);
 	ocfs2_init_steal_slots(osb);
 
+	mutex_init(&osb->system_file_mutex);
+
 	atomic_set(&osb->alloc_stats.moves, 0);
 	atomic_set(&osb->alloc_stats.local_data, 0);
 	atomic_set(&osb->alloc_stats.bitmap_data, 0);