diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index a88b2a4fcc85171210cd17f8e4f9a791d5aa1d2b..d5493e361a381b12a9d57a779294fb172fb963b3 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -306,7 +306,7 @@ int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
 	assert_spin_locked(&osb->osb_lock);
 
 	BUG_ON(slot_num < 0);
-	BUG_ON(slot_num > osb->max_slots);
+	BUG_ON(slot_num >= osb->max_slots);
 
 	if (!si->si_slots[slot_num].sl_valid)
 		return -ENOENT;