diff --git a/sys/cam/cam_xpt.c b/sys/cam/cam_xpt.c
index 8c52605a013..bc7813f4a9b 100644
--- a/sys/cam/cam_xpt.c
+++ b/sys/cam/cam_xpt.c
@@ -5435,7 +5435,8 @@ xpt_done_process(struct ccb_hdr *ccb_h)
 
 		if (sim)
 			devq = sim->devq;
-		KASSERT(devq, ("Periph disappeared with request pending."));
+		KASSERT(devq, ("Periph disappeared with CCB %p %s request pending.",
+			ccb_h, xpt_action_name(ccb_h->func_code)));
 
 		mtx_lock(&devq->send_mtx);
 		devq->send_active--;