diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 37e4ff6..e14f457 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1105,7 +1105,7 @@
 				if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
 					wake_up(&conf->wait_for_overlap);
 
-				if (sh->dev[i].written) BUG();
+				BUG_ON(sh->dev[i].written);
 				sh->dev[i].written = chosen;
 			}
 		break;