diff --git a/composer.json b/composer.json
index 506ebc413d..71dcc9605c 100644
--- a/composer.json
+++ b/composer.json
@@ -54,14 +54,8 @@
         ],
         "post-package-install": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup",
         "post-package-update": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup",
-        "phpcs": [
-            "Drupal\\Core\\Composer\\Composer::exportVendor",
-            "phpcs --standard=core/phpcs.xml.dist --runtime-set installed_paths $COMPOSER_VENDOR_DIR/drupal/coder/coder_sniffer --"
-        ],
-        "phpcbf": [
-            "Drupal\\Core\\Composer\\Composer::exportVendor",
-            "phpcbf --standard=core/phpcs.xml.dist --runtime-set installed_paths $COMPOSER_VENDOR_DIR/drupal/coder/coder_sniffer --"
-        ]
+        "phpcs": "phpcs --standard=core/phpcs.xml.dist --runtime-set installed_paths $($COMPOSER_BINARY config vendor-dir)/drupal/coder/coder_sniffer --",
+        "phpcbf": "phpcbf --standard=core/phpcs.xml.dist --runtime-set installed_paths $($COMPOSER_BINARY config vendor-dir)/drupal/coder/coder_sniffer --"
     },
     "repositories": [
         {
diff --git a/core/lib/Drupal/Core/Composer/Composer.php b/core/lib/Drupal/Core/Composer/Composer.php
index bd0d56771c..016f93a348 100644
--- a/core/lib/Drupal/Core/Composer/Composer.php
+++ b/core/lib/Drupal/Core/Composer/Composer.php
@@ -198,16 +198,6 @@ public static function vendorTestCodeCleanup(PackageEvent $event) {
     }
   }
 
-  /**
-   * Exports the vendor directory as an environment variable.
-   *
-   * @param \Composer\Script\Event $event
-   *   The composer script event.
-   */
-  public static function exportVendor(Event $event) {
-    putenv("COMPOSER_VENDOR_DIR=" . $event->getComposer()->getConfig()->get('vendor-dir'));
-  }
-
   /**
    * Find the array key for a given package name with a case-insensitive search.
    *