diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index f4a96dbdabf2..b3de973a6260 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -41,6 +41,9 @@
 #include <linux/pm.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#ifdef CONFIG_X86
+#include <asm/i8259.h>
+#endif
 
 /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */
 #include <linux/mc146818rtc.h>
@@ -1193,17 +1196,23 @@ static int cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
 {
 	cmos_wake_setup(&pnp->dev);
 
-	if (pnp_port_start(pnp, 0) == 0x70 && !pnp_irq_valid(pnp, 0))
+	if (pnp_port_start(pnp, 0) == 0x70 && !pnp_irq_valid(pnp, 0)) {
+		unsigned int irq = 0;
+#ifdef CONFIG_X86
 		/* Some machines contain a PNP entry for the RTC, but
 		 * don't define the IRQ. It should always be safe to
-		 * hardcode it in these cases
+		 * hardcode it on systems with a legacy PIC.
 		 */
+		if (nr_legacy_irqs())
+			irq = 8;
+#endif
 		return cmos_do_probe(&pnp->dev,
-				pnp_get_resource(pnp, IORESOURCE_IO, 0), 8);
-	else
+				pnp_get_resource(pnp, IORESOURCE_IO, 0), irq);
+	} else {
 		return cmos_do_probe(&pnp->dev,
 				pnp_get_resource(pnp, IORESOURCE_IO, 0),
 				pnp_irq(pnp, 0));
+	}
 }
 
 static void cmos_pnp_remove(struct pnp_dev *pnp)