diff --git a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
index b4b7055db1..559961597d 100644
--- a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
@@ -236,7 +236,7 @@ class UrlMatcher implements UrlMatcherInterface, RequestMatcherInterface
     {
         if (null === $this->expressionLanguage) {
             if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
-                throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
+                throw new \RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
             }
             $this->expressionLanguage = new ExpressionLanguage();
         }