diff --git a/drivers/iio/light/opt4001.c b/drivers/iio/light/opt4001.c
index 2448d6330489..aa3d87995b7c 100644
--- a/drivers/iio/light/opt4001.c
+++ b/drivers/iio/light/opt4001.c
@@ -39,7 +39,7 @@
 #define OPT4001_CTRL_OPER_MODE_MASK      GENMASK(5, 4)
 #define OPT4001_CTRL_LATCH_MASK          GENMASK(3, 3)
 #define OPT4001_CTRL_INT_POL_MASK        GENMASK(2, 2)
-#define OPT4001_CTRL_FAULT_COUNT         GENMASK(0, 1)
+#define OPT4001_CTRL_FAULT_COUNT_MASK    GENMASK(1, 0)
 
 /* OPT4001 constants */
 #define OPT4001_DEVICE_ID_VAL            0x121