diff --git a/src/Environment/Environment.php b/src/Environment/Environment.php
index a8112967e4..9e03652573 100644
--- a/src/Environment/Environment.php
+++ b/src/Environment/Environment.php
@@ -442,6 +442,7 @@ public static function createDefaultConfiguration(): Configuration
                 'instance' => Expect::type(TextNormalizerInterface::class)->default(new SlugNormalizer()),
                 'max_length' => Expect::int()->min(0)->default(255),
                 'unique' => Expect::anyOf(UniqueSlugNormalizerInterface::DISABLED, UniqueSlugNormalizerInterface::PER_ENVIRONMENT, UniqueSlugNormalizerInterface::PER_DOCUMENT)->default(UniqueSlugNormalizerInterface::PER_DOCUMENT),
+	            'delimiter' => Expect::string()->default('-')
             ]),
         ]);
     }