diff --git a/src/Symfony/Component/Translation/MessageCatalogue.php b/src/Symfony/Component/Translation/MessageCatalogue.php
index 9b59c87d2f..cc4a0bfaba 100644
--- a/src/Symfony/Component/Translation/MessageCatalogue.php
+++ b/src/Symfony/Component/Translation/MessageCatalogue.php
@@ -130,7 +130,9 @@ class MessageCatalogue implements MessageCatalogueInterface, MetadataAwareInterf
         if (!isset($this->messages[$domain])) {
             $this->messages[$domain] = $messages;
         } else {
-            $this->messages[$domain] = array_replace($this->messages[$domain], $messages);
+            foreach ($messages as $id => $message) {
+                $this->messages[$domain][$id] = $message;
+            }
         }
     }