diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c
index 43d9e7407795..5c68e3177f64 100644
--- a/drivers/hwmon/pmbus/adm1266.c
+++ b/drivers/hwmon/pmbus/adm1266.c
@@ -61,7 +61,7 @@ struct adm1266_data {
 	u8 *dev_mem;
 	struct mutex buf_mutex;
 	u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
-	u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
+	u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 2] ____cacheline_aligned;
 };
 
 static const struct nvmem_cell_info adm1266_nvmem_cells[] = {