diff --git a/sys/kern/subr_gtaskqueue.c b/sys/kern/subr_gtaskqueue.c
index 9423dd8..1a086c9 100644
--- a/sys/kern/subr_gtaskqueue.c
+++ b/sys/kern/subr_gtaskqueue.c
@@ -790,6 +790,7 @@ _taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
 
 	while ((gtask = LIST_FIRST(&gtask_head))) {
 		LIST_REMOVE(gtask, gt_list);
+		qid=-1;
 		if (gtask->gt_cpu == -1)
 			qid = taskqgroup_find(qgroup, gtask->gt_uniq);
 		else {
@@ -799,6 +800,7 @@ _taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
 					break;
 				}
 		}
+		KASSERT(qid != -1, ("_taskgroup_adjust: qid cannot be -1"));
 		qgroup->tqg_queue[qid].tgc_cnt++;
 		LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask,
 		    gt_list);