diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index 1c39eccc1eaf..2f274f30b7e2 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -278,7 +278,7 @@ int irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
 	if (d->revmap_type != IRQ_DOMAIN_MAP_LINEAR)
 		return -EINVAL;
 
-	numchips = d->revmap_data.linear.size / irqs_per_chip;
+	numchips = DIV_ROUND_UP(d->revmap_data.linear.size, irqs_per_chip);
 	if (!numchips)
 		return -EINVAL;