diff --git a/src/Symfony/Component/HttpKernel/UriSigner.php b/src/Symfony/Component/HttpKernel/UriSigner.php
index 99d5932b15..665e99e2ef 100644
--- a/src/Symfony/Component/HttpKernel/UriSigner.php
+++ b/src/Symfony/Component/HttpKernel/UriSigner.php
@@ -58,7 +58,7 @@ class UriSigner
      */
     public function check($uri)
     {
-        if (!preg_match('/(.*)(?:\?|&)_hash=(.+?)$/', $uri, $matches)) {
+        if (!preg_match('/^(.*)(?:\?|&)_hash=(.+?)$/', $uri, $matches)) {
             return false;
         }