diff --git a/src/Symfony/Component/Routing/Loader/Configurator/Traits/PrefixTrait.php b/src/Symfony/Component/Routing/Loader/Configurator/Traits/PrefixTrait.php
index 094b086231..27053bcaf5 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/Traits/PrefixTrait.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/Traits/PrefixTrait.php
@@ -13,7 +13,6 @@ namespace Symfony\Component\Routing\Loader\Configurator\Traits;
 
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\RouteCompiler;
 
 /**
  * @internal
@@ -34,7 +33,7 @@ trait PrefixTrait
                     foreach ($prefix as $locale => $localePrefix) {
                         $localizedRoute = clone $route;
                         $localizedRoute->setDefault('_locale', $locale);
-                        $localizedRoute->setRequirement('_locale', preg_quote($locale, RouteCompiler::REGEX_DELIMITER));
+                        $localizedRoute->setRequirement('_locale', preg_quote($locale));
                         $localizedRoute->setDefault('_canonical_route', $name);
                         $localizedRoute->setPath($localePrefix.(!$trailingSlashOnRoot && '/' === $route->getPath() ? '' : $route->getPath()));
                         $routes->add($name.'.'.$locale, $localizedRoute);
diff --git a/src/Symfony/Component/Routing/Route.php b/src/Symfony/Component/Routing/Route.php
index cbe8c6cb86..7ed8d2b146 100644
--- a/src/Symfony/Component/Routing/Route.php
+++ b/src/Symfony/Component/Routing/Route.php
@@ -563,6 +563,6 @@ class Route implements \Serializable
 
     private function isLocalized(): bool
     {
-        return isset($this->defaults['_locale']) && isset($this->defaults['_canonical_route']) && ($this->requirements['_locale'] ?? null) === preg_quote($this->defaults['_locale'], RouteCompiler::REGEX_DELIMITER);
+        return isset($this->defaults['_locale']) && isset($this->defaults['_canonical_route']) && ($this->requirements['_locale'] ?? null) === preg_quote($this->defaults['_locale']);
     }
 }
diff --git a/src/Symfony/Component/Routing/RouteCompiler.php b/src/Symfony/Component/Routing/RouteCompiler.php
index 2e29329e2d..fd09f6ae3c 100644
--- a/src/Symfony/Component/Routing/RouteCompiler.php
+++ b/src/Symfony/Component/Routing/RouteCompiler.php
@@ -65,7 +65,7 @@ class RouteCompiler implements RouteCompilerInterface
         }
 
         $locale = $route->getDefault('_locale');
-        if (null !== $locale && null !== $route->getDefault('_canonical_route') && preg_quote($locale, self::REGEX_DELIMITER) === $route->getRequirement('_locale')) {
+        if (null !== $locale && null !== $route->getDefault('_canonical_route') && preg_quote($locale) === $route->getRequirement('_locale')) {
             $requirements = $route->getRequirements();
             unset($requirements['_locale']);
             $route->setRequirements($requirements);