We use magento 2.2.2 and we need a longer SKU. We set "const SKU_MAX_LENGTH = 255;" in the file module-catalog/Model/Product/Attribute/Backend/Sku.php but it does not work

  • You also need to increase it in database Jun 20, 2018 at 7:42
  • What is the error you are getting? Jun 20, 2018 at 7:44

3 Answers 3


You need to change the into database as well. Goto table eav_attribute, search for sku at column attribute code then edit the resulted row.

Update the field frontend_class to null or validate-length maximum-length-255 according to your requirement.

Now check the admin it works.


You have to change field size at the database table.

ALTER TABLE `catalog_product_entity` CHANGE `sku` `sku` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT 'SKU';
  • If we run setup:upgrade, It changes this field to VARCHAR(64) again. Any idea why? Sep 8, 2021 at 13:59

you can install this module it will increase sku length upto 255 https://github.com/Mehran515/Increase-Sku-Length

  • Please disclose affiliation when linking to your own content. Oct 19, 2023 at 15:28
  • what how do i disclose affiliation?
    – Mehran
    Oct 20, 2023 at 6:18
  • A simple "This is my repository" or something to that effect will do. Oct 20, 2023 at 13:44

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