diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 96eeda433ad66a5b40ddb45b2b70e87cca484523..b44a853a83909b0de02d97c6a41d144d690f4123 100644
--- a/drivers/iio/adc/ad7923.c
+++ b/drivers/iio/adc/ad7923.c
@@ -47,7 +47,7 @@
 
 struct ad7923_state {
 	struct spi_device		*spi;
-	struct spi_transfer		ring_xfer[5];
+	struct spi_transfer		ring_xfer[9];
 	struct spi_transfer		scan_single_xfer[2];
 	struct spi_message		ring_msg;
 	struct spi_message		scan_single_msg;
@@ -63,7 +63,7 @@ struct ad7923_state {
 	 * Length = 8 channels + 4 extra for 8 byte timestamp
 	 */
 	__be16				rx_buf[12] ____cacheline_aligned;
-	__be16				tx_buf[4];
+	__be16				tx_buf[8];
 };
 
 struct ad7923_chip_info {