diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c
index 7c524b4e415d..16be4c56abe3 100644
--- a/arch/arm/mach-sa1100/generic.c
+++ b/arch/arm/mach-sa1100/generic.c
@@ -306,7 +306,7 @@ void sa11x0_register_irda(struct irda_platform_data *irda)
 }
 
 static struct resource sa1100_rtc_resources[] = {
-	DEFINE_RES_MEM(0x90010000, 0x9001003f),
+	DEFINE_RES_MEM(0x90010000, 0x40),
 	DEFINE_RES_IRQ_NAMED(IRQ_RTC1Hz, "rtc 1Hz"),
 	DEFINE_RES_IRQ_NAMED(IRQ_RTCAlrm, "rtc alarm"),
 };