diff --git a/src/Symfony/Component/Security/composer.json b/src/Symfony/Component/Security/composer.json
index cdcbba75f7d4..5d50f8202129 100644
--- a/src/Symfony/Component/Security/composer.json
+++ b/src/Symfony/Component/Security/composer.json
@@ -33,6 +33,7 @@
     "require-dev": {
         "psr/container": "^1.0",
         "symfony/finder": "~2.8|~3.0|~4.0",
+        "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-intl-icu": "~1.0",
         "symfony/routing": "~2.8|~3.0|~4.0",
         "symfony/validator": "^3.2.5|~4.0",