diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c
index 3825c2f2f99eb816db01ec0429294f6bdb0e680e..4f682ad97bc2592ca2917fc010a15b4bb4a82bc2 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -576,6 +576,10 @@ static int af9035_download_firmware(struct dvb_usb_device *d,
 			goto err;
 
 		if (state->chip_type == 0x9135) {
+			if (!tmp)
+				/* default 0x9135 slave I2C address */
+				tmp = 0x3a;
+
 			ret = af9035_wr_reg(d, 0x004bfb, tmp);
 			if (ret < 0)
 				goto err;
@@ -684,6 +688,10 @@ static int af9035_read_config(struct dvb_usb_device *d)
 		if (ret < 0)
 			goto err;
 
+		if (!tmp && state->chip_type == 0x9135)
+			/* default 0x9135 slave I2C address */
+			tmp = 0x3a;
+
 		state->af9033_config[1].i2c_addr = tmp;
 		dev_dbg(&d->udev->dev, "%s: 2nd demod I2C addr=%02x\n",
 				__func__, tmp);