diff --git a/src/lock.c b/src/lock.c
index 4edcb4f56..58da7e690 100644
--- a/src/lock.c
+++ b/src/lock.c
@@ -476,7 +476,7 @@ doforce()		/* try to force a chest with your weapon */
 		else
 		    You("start bashing it with your %s.", xname(uwep));
 		xlock.box = otmp;
-		xlock.chance = objects[otmp->otyp].oc_wldam * 2;
+		xlock.chance = objects[uwep->otyp].oc_wldam * 2;
 		xlock.picktyp = picktyp;
 		xlock.usedtime = 0;
 		break;