diff --git a/drivers/irqchip/irq-i8259.c b/drivers/irqchip/irq-i8259.c
index 7aafbb091b67..b0d4aab1a58c 100644
--- a/drivers/irqchip/irq-i8259.c
+++ b/drivers/irqchip/irq-i8259.c
@@ -289,14 +289,14 @@ static struct resource pic1_io_resource = {
 	.name = "pic1",
 	.start = PIC_MASTER_CMD,
 	.end = PIC_MASTER_IMR,
-	.flags = IORESOURCE_BUSY
+	.flags = IORESOURCE_IO | IORESOURCE_BUSY
 };
 
 static struct resource pic2_io_resource = {
 	.name = "pic2",
 	.start = PIC_SLAVE_CMD,
 	.end = PIC_SLAVE_IMR,
-	.flags = IORESOURCE_BUSY
+	.flags = IORESOURCE_IO | IORESOURCE_BUSY
 };
 
 static int i8259A_irq_domain_map(struct irq_domain *d, unsigned int virq,