diff --git a/src/Symfony/Component/Routing/Route.php b/src/Symfony/Component/Routing/Route.php
index 4d5fdc1afb5e0..83f9a0a3896c9 100644
--- a/src/Symfony/Component/Routing/Route.php
+++ b/src/Symfony/Component/Routing/Route.php
@@ -149,6 +149,7 @@ public function getHostnamePattern()
     public function setHostnamePattern($pattern)
     {
         $this->hostnamePattern = (string) $pattern;
+        $this->compiled = null;
 
         return $this;
     }