diff --git a/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php b/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php
index a91aef6175..37c8c5719d 100644
--- a/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php
+++ b/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php
@@ -60,6 +60,9 @@ class TranslatorPathsPass extends AbstractRecursivePass
             foreach ($this->paths as $class => $_) {
                 if (($r = $container->getReflectionClass($class)) && !$r->isInterface()) {
                     $paths[] = $r->getFileName();
+                    foreach ($r->getTraits() as $trait) {
+                        $paths[] = $trait->getFileName();
+                    }
                 }
             }
             if ($paths) {