diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c
index a86666c73a5e..94691dec1359 100644
--- a/drivers/hwmon/pmbus/adm1266.c
+++ b/drivers/hwmon/pmbus/adm1266.c
@@ -349,7 +349,7 @@ static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff)
 {
 	int record_count;
 	char index;
-	u8 buf[5];
+	u8 buf[I2C_SMBUS_BLOCK_MAX];
 	int ret;
 
 	ret = i2c_smbus_read_block_data(data->client, ADM1266_BLACKBOX_INFO, buf);