diff --git a/drivers/iio/imu/fxos8700_core.c b/drivers/iio/imu/fxos8700_core.c
index 1d07de88e240..9c8e0d6ec87e 100644
--- a/drivers/iio/imu/fxos8700_core.c
+++ b/drivers/iio/imu/fxos8700_core.c
@@ -425,7 +425,7 @@ static int fxos8700_get_data(struct fxos8700_data *data, int chan_type,
 
 	/* Block read 6 bytes of device output registers to avoid data loss */
 	ret = regmap_bulk_read(data->regmap, base, data->buf,
-			       FXOS8700_DATA_BUF_SIZE);
+			       sizeof(data->buf));
 	if (ret)
 		return ret;