diff --git a/drivers/watchdog/sp5100_tco.h b/drivers/watchdog/sp5100_tco.h
index 71594a0c14b735f56decde5e1ac5e01543fbda6c..2b28c00da0df00d2f99a8c5283b2d2b7c84a9ffa 100644
--- a/drivers/watchdog/sp5100_tco.h
+++ b/drivers/watchdog/sp5100_tco.h
@@ -57,7 +57,7 @@
 #define SB800_PM_WATCHDOG_DISABLE	(1 << 2)
 #define SB800_PM_WATCHDOG_SECOND_RES	(3 << 0)
 #define SB800_ACPI_MMIO_DECODE_EN	(1 << 0)
-#define SB800_ACPI_MMIO_SEL		(1 << 2)
+#define SB800_ACPI_MMIO_SEL		(1 << 1)
 
 
 #define SB800_PM_WDT_MMIO_OFFSET	0xB00