diff --git a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
index 6bd7bb4c9e..75093580b4 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
@@ -288,6 +288,10 @@ class StaleResource implements SelfCheckingResourceInterface
         return false;
     }
 
+    public function getResource()
+    {
+    }
+
     public function __toString()
     {
         return '';