diff --git a/drivers/mfd/rc5t583.c b/drivers/mfd/rc5t583.c
index e10f02f5d551..fc2b2d93f354 100644
--- a/drivers/mfd/rc5t583.c
+++ b/drivers/mfd/rc5t583.c
@@ -241,8 +241,8 @@ static const struct regmap_config rc5t583_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.volatile_reg = volatile_reg,
-	.max_register = RC5T583_MAX_REGS,
-	.num_reg_defaults_raw = RC5T583_MAX_REGS,
+	.max_register = RC5T583_MAX_REG,
+	.num_reg_defaults_raw = RC5T583_NUM_REGS,
 	.cache_type = REGCACHE_RBTREE,
 };
 
diff --git a/include/linux/mfd/rc5t583.h b/include/linux/mfd/rc5t583.h
index fd413ccab915..8d0a392e0a7f 100644
--- a/include/linux/mfd/rc5t583.h
+++ b/include/linux/mfd/rc5t583.h
@@ -28,8 +28,6 @@
 #include <linux/types.h>
 #include <linux/regmap.h>
 
-#define RC5T583_MAX_REGS		0xF8
-
 /* Maximum number of main interrupts */
 #define MAX_MAIN_INTERRUPT		5
 #define RC5T583_MAX_GPEDGE_REG		2
@@ -169,6 +167,9 @@
 #define RC5T583_RTC_AY_MONTH 0xF3
 #define RC5T583_RTC_AY_YEAR	0xF4
 
+#define RC5T583_MAX_REG		0xF7
+#define RC5T583_NUM_REGS	(RC5T583_MAX_REG + 1)
+
 /* RICOH_RC5T583 IRQ definitions */
 enum {
 	RC5T583_IRQ_ONKEY,