diff --git a/composer.json b/composer.json
index ce6d5620..2e40b783 100644
--- a/composer.json
+++ b/composer.json
@@ -81,7 +81,7 @@
     "test": "phpunit",
     "prefix-dependencies": [
       "vendor-bin/php-scoper/vendor/bin/php-scoper add-prefix --output-dir=./vendor-prefixed --force --quiet",
-      "echo '{ \"autoload\": { \"classmap\": [\"\"], \"exclude-from-classmap\": [\"vendor\\/squizlabs//\"] } }' > ./vendor-prefixed/composer.json",
+      "echo '{ \"autoload\": { \"classmap\": [\"\"], \"exclude-from-classmap\": [\"vendor\\/squizlabs//\", \"vendor\\/automattic//\"] } }' > ./vendor-prefixed/composer.json",
       "@composer dump-autoload --working-dir ./vendor-prefixed --no-dev --classmap-authoritative",
       "sed -i'.bak' -e 's/Composer\\\\Autoload/Plugin_Check_Composer\\\\Autoload/' vendor-prefixed/vendor/composer/*.php",
       "rm -rf vendor-prefixed/vendor/composer/*.php.bak",