--- src/sys/dev/disk/ahb/ahb.c	2008/02/10 00:01:02	1.18
+++ src/sys/dev/disk/ahb/ahb.c	2008/05/18 20:30:21	1.19
@@ -526,7 +526,7 @@ ahbxptattach(struct ahb_softc *ahb)
 	 * Construct our SIM entry
 	 */
 	ahb->sim = cam_sim_alloc(ahbaction, ahbpoll, "ahb", ahb, ahb->unit,
-				 2, ahb->num_ecbs, NULL);
+				 &sim_mplock, 2, ahb->num_ecbs, NULL);
 	if (ahb->sim == NULL)
 		return (ENOMEM);