diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 4337c3bc6acef06e41daf18032acd43398a16503..afea84c7a155cc962dae5f6b85ebbef106e8c44e 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -28,7 +28,7 @@
 #define ABX8XX_REG_WD		0x07
 
 #define ABX8XX_REG_CTRL1	0x10
-#define ABX8XX_CTRL_WRITE	BIT(1)
+#define ABX8XX_CTRL_WRITE	BIT(0)
 #define ABX8XX_CTRL_12_24	BIT(6)
 
 #define ABX8XX_REG_CFG_KEY	0x1f