diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c
index fd14fc4021a3..e0cff5f3647a 100644
--- a/sys/kern/sched_ule.c
+++ b/sys/kern/sched_ule.c
@@ -1406,7 +1406,7 @@ sched_priority(struct thread *td)
 	 * score.  Negative nice values make it easier for a thread to be
 	 * considered interactive.
 	 */
-	score = imax(0, sched_interact_score(td) - td->td_proc->p_nice);
+	score = imax(0, sched_interact_score(td) + td->td_proc->p_nice);
 	if (score < sched_interact) {
 		pri = PRI_MIN_REALTIME;
 		pri += ((PRI_MAX_REALTIME - PRI_MIN_REALTIME) / sched_interact)