diff --git a/drivers/rtc/rtc-ds1553.c b/drivers/rtc/rtc-ds1553.c
index 46da5714932c3e15f9607058a4855aeba02f6e3d..5ab3492817d16b0574202380b9ddb2a394042ba5 100644
--- a/drivers/rtc/rtc-ds1553.c
+++ b/drivers/rtc/rtc-ds1553.c
@@ -61,7 +61,7 @@
 struct rtc_plat_data {
 	struct rtc_device *rtc;
 	void __iomem *ioaddr;
-	unsigned long baseaddr;
+	resource_size_t baseaddr;
 	unsigned long last_jiffies;
 	int irq;
 	unsigned int irqen;