diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
index b4323d2db0b1..0ed3392a33cf 100644
--- a/drivers/iio/light/ltr501.c
+++ b/drivers/iio/light/ltr501.c
@@ -32,9 +32,12 @@
 #define LTR501_PART_ID 0x86
 #define LTR501_MANUFAC_ID 0x87
 #define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */
+#define LTR501_ALS_DATA1_UPPER 0x89 /* upper 8 bits of LTR501_ALS_DATA1 */
 #define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */
+#define LTR501_ALS_DATA0_UPPER 0x8b /* upper 8 bits of LTR501_ALS_DATA0 */
 #define LTR501_ALS_PS_STATUS 0x8c
 #define LTR501_PS_DATA 0x8d /* 16-bit, little endian */
+#define LTR501_PS_DATA_UPPER 0x8e /* upper 8 bits of LTR501_PS_DATA */
 #define LTR501_INTR 0x8f /* output mode, polarity, mode */
 #define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */
 #define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */
@@ -1354,9 +1357,12 @@ static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case LTR501_ALS_DATA1:
+	case LTR501_ALS_DATA1_UPPER:
 	case LTR501_ALS_DATA0:
+	case LTR501_ALS_DATA0_UPPER:
 	case LTR501_ALS_PS_STATUS:
 	case LTR501_PS_DATA:
+	case LTR501_PS_DATA_UPPER:
 		return true;
 	default:
 		return false;