--- src/sys/dev/disk/mpt/mpt_freebsd.c	2008/02/10 00:01:02	1.10
+++ src/sys/dev/disk/mpt/mpt_freebsd.c	2008/05/18 20:30:22	1.11
@@ -55,7 +55,7 @@ mpt_cam_attach(mpt_softc_t *mpt)
 	 * Construct our SIM entry.
 	 */
 	sim = cam_sim_alloc(mpt_action, mpt_poll, "mpt", mpt,
-	    mpt->unit, 1, maxq, NULL);
+	    mpt->unit, &sim_mplock, 1, maxq, NULL);
 	if (sim == NULL)
 		return;