diff --git a/Magento2/Sniffs/Less/ClassNamingSniff.php b/Magento2/Sniffs/Less/ClassNamingSniff.php
index e684172b..babd0653 100644
--- a/Magento2/Sniffs/Less/ClassNamingSniff.php
+++ b/Magento2/Sniffs/Less/ClassNamingSniff.php
@@ -66,7 +66,10 @@ public function process(File $phpcsFile, $stackPtr)
                 [implode("", $matches[0])]
             );
         }
-        if (strpos($className, self::STRING_HELPER_CLASSES_PREFIX, 2) !== false) {
+
+        if (strpos($className, self::STRING_HELPER_CLASSES_PREFIX, 2) !== false
+            && !str_starts_with($className, 'admin__')
+        ) {
             $phpcsFile->addError(
                 'CSS class names should be separated with "-" (dash) instead of "_" (underscore)',
                 $stackPtr,
diff --git a/Magento2/Tests/Less/ClassNamingUnitTest.less b/Magento2/Tests/Less/ClassNamingUnitTest.less
index ba60c205..bbb29cde 100644
--- a/Magento2/Tests/Less/ClassNamingUnitTest.less
+++ b/Magento2/Tests/Less/ClassNamingUnitTest.less
@@ -30,3 +30,8 @@
 .category-title {
   background: green;
 }
+
+// @see https://github.com/magento/magento-coding-standard/issues/409
+.admin__allowed {
+  background: green;
+}
diff --git a/composer.json b/composer.json
index fd6d43a7..8216e509 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
         "ext-dom": "*",
         "phpcompatibility/php-compatibility": "^9.3",
         "squizlabs/php_codesniffer": "^3.6.1",
-        "rector/rector": "^0.15.10"
+        "rector/rector": "^0.15.10",
+        "symfony/polyfill": "^1.16"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5.8"
diff --git a/composer.lock b/composer.lock
index 23393d2e..af2c3b88 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d5b737bfcab2053b6a04725293a5abff",
+    "content-hash": "7281808f33bc1154ee5a0ec2a358847b",
     "packages": [
         {
             "name": "dealerdirect/phpcodesniffer-composer-installer",
@@ -317,6 +317,123 @@
             },
             "time": "2022-06-18T07:21:10+00:00"
         },
+        {
+            "name": "symfony/polyfill",
+            "version": "v1.27.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill.git",
+                "reference": "b78222a273aac3e5bab6358bf499d7f1fb88e48b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill/zipball/b78222a273aac3e5bab6358bf499d7f1fb88e48b",
+                "reference": "b78222a273aac3e5bab6358bf499d7f1fb88e48b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "replace": {
+                "symfony/polyfill-apcu": "self.version",
+                "symfony/polyfill-ctype": "self.version",
+                "symfony/polyfill-iconv": "self.version",
+                "symfony/polyfill-intl-grapheme": "self.version",
+                "symfony/polyfill-intl-icu": "self.version",
+                "symfony/polyfill-intl-idn": "self.version",
+                "symfony/polyfill-intl-messageformatter": "self.version",
+                "symfony/polyfill-intl-normalizer": "self.version",
+                "symfony/polyfill-mbstring": "self.version",
+                "symfony/polyfill-php72": "self.version",
+                "symfony/polyfill-php73": "self.version",
+                "symfony/polyfill-php74": "self.version",
+                "symfony/polyfill-php80": "self.version",
+                "symfony/polyfill-php81": "self.version",
+                "symfony/polyfill-php82": "self.version",
+                "symfony/polyfill-php83": "self.version",
+                "symfony/polyfill-util": "self.version",
+                "symfony/polyfill-uuid": "self.version",
+                "symfony/polyfill-xml": "self.version"
+            },
+            "require-dev": {
+                "symfony/intl": "^4.4|^5.0|^6.0",
+                "symfony/phpunit-bridge": "^5.3|^6.0",
+                "symfony/var-dumper": "^4.4|^5.1|^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.27-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "src/bootstrap.php",
+                    "src/Apcu/bootstrap.php",
+                    "src/Ctype/bootstrap.php",
+                    "src/Uuid/bootstrap.php",
+                    "src/Iconv/bootstrap.php",
+                    "src/Intl/Grapheme/bootstrap.php",
+                    "src/Intl/Idn/bootstrap.php",
+                    "src/Intl/Icu/bootstrap.php",
+                    "src/Intl/MessageFormatter/bootstrap.php",
+                    "src/Intl/Normalizer/bootstrap.php",
+                    "src/Mbstring/bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\": "src/"
+                },
+                "classmap": [
+                    "src/Intl/Icu/Resources/stubs",
+                    "src/Intl/MessageFormatter/Resources/stubs",
+                    "src/Intl/Normalizer/Resources/stubs",
+                    "src/Php82/Resources/stubs",
+                    "src/Php80/Resources/stubs",
+                    "src/Php73/Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfills backporting features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compat",
+                "compatibility",
+                "polyfill",
+                "shim"
+            ],
+            "support": {
+                "issues": "https://github.com/symfony/polyfill/issues",
+                "source": "https://github.com/symfony/polyfill/tree/v1.27.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-11-10T10:11:03+00:00"
+        },
         {
             "name": "webonyx/graphql-php",
             "version": "v15.0.0",