diff --git a/src/Symfony/Component/Inflector/composer.json b/src/Symfony/Component/Inflector/composer.json
index 7373a93bac2b1..3fa828c0fc73f 100644
--- a/src/Symfony/Component/Inflector/composer.json
+++ b/src/Symfony/Component/Inflector/composer.json
@@ -25,7 +25,6 @@
     "require": {
         "php": "^7.2.5",
         "symfony/deprecation-contracts": "^2.1",
-        "symfony/polyfill-ctype": "~1.8",
         "symfony/string": "^5.1"
     },
     "autoload": {
diff --git a/src/Symfony/Component/String/composer.json b/src/Symfony/Component/String/composer.json
index ec936e019d727..eb498b0847935 100644
--- a/src/Symfony/Component/String/composer.json
+++ b/src/Symfony/Component/String/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": "^7.2.5",
+        "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-intl-grapheme": "~1.0",
         "symfony/polyfill-intl-normalizer": "~1.0",
         "symfony/polyfill-mbstring": "~1.0",