diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index b2e5481..67291b0 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -55,7 +55,7 @@
 	void __iomem *ioaddr_rtc;
 	size_t size_nvram;
 	size_t size;
-	unsigned long baseaddr;
+	resource_size_t baseaddr;
 	unsigned long last_jiffies;
 };