diff --git a/kernel/include/priority_q.h b/kernel/include/priority_q.h
index 09f86caa819..4b49ce3ee22 100644
--- a/kernel/include/priority_q.h
+++ b/kernel/include/priority_q.h
@@ -280,7 +280,7 @@ static ALWAYS_INLINE unsigned int z_priq_mq_best_queue_index(struct _priq_mq *pq
 
 static ALWAYS_INLINE void z_priq_mq_init(struct _priq_mq *q)
 {
-	for (int i = 0; i < ARRAY_SIZE(q->queues); i++) {
+	for (size_t i = 0; i < ARRAY_SIZE(q->queues); i++) {
 		sys_dlist_init(&q->queues[i]);
 	}