diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
index 715c44fade..9f2012816a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
@@ -45,7 +45,7 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
     {
         $translator = $this->getTranslator($this->getLoader());
         $translator->setLocale('fr');
-        $translator->setFallbackLocales(array('en', 'es', 'pt-PT', 'pt_BR', 'fr.UTF-8'));
+        $translator->setFallbackLocales(array('en', 'es', 'pt-PT', 'pt_BR', 'fr.UTF-8', 'sr@latin'));
 
         $this->assertEquals('foo (FR)', $translator->trans('foo'));
         $this->assertEquals('bar (EN)', $translator->trans('bar'));
@@ -55,6 +55,7 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('foobarfoo (PT-PT)', $translator->trans('foobarfoo'));
         $this->assertEquals('other choice 1 (PT-BR)', $translator->transChoice('other choice', 1));
         $this->assertEquals('foobarbaz (fr.UTF-8)', $translator->trans('foobarbaz'));
+        $this->assertEquals('foobarbax (sr@latin)', $translator->trans('foobarbax'));
     }
 
     public function testTransWithCaching()
@@ -62,7 +63,7 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         // prime the cache
         $translator = $this->getTranslator($this->getLoader(), array('cache_dir' => $this->tmpDir));
         $translator->setLocale('fr');
-        $translator->setFallbackLocales(array('en', 'es', 'pt-PT', 'pt_BR', 'fr.UTF-8'));
+        $translator->setFallbackLocales(array('en', 'es', 'pt-PT', 'pt_BR', 'fr.UTF-8', 'sr@latin'));
 
         $this->assertEquals('foo (FR)', $translator->trans('foo'));
         $this->assertEquals('bar (EN)', $translator->trans('bar'));
@@ -72,12 +73,13 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('foobarfoo (PT-PT)', $translator->trans('foobarfoo'));
         $this->assertEquals('other choice 1 (PT-BR)', $translator->transChoice('other choice', 1));
         $this->assertEquals('foobarbaz (fr.UTF-8)', $translator->trans('foobarbaz'));
+        $this->assertEquals('foobarbax (sr@latin)', $translator->trans('foobarbax'));
 
         // do it another time as the cache is primed now
         $loader = $this->getMock('Symfony\Component\Translation\Loader\LoaderInterface');
         $translator = $this->getTranslator($loader, array('cache_dir' => $this->tmpDir));
         $translator->setLocale('fr');
-        $translator->setFallbackLocales(array('en', 'es', 'pt-PT', 'pt_BR', 'fr.UTF-8'));
+        $translator->setFallbackLocales(array('en', 'es', 'pt-PT', 'pt_BR', 'fr.UTF-8', 'sr@latin'));
 
         $this->assertEquals('foo (FR)', $translator->trans('foo'));
         $this->assertEquals('bar (EN)', $translator->trans('bar'));
@@ -87,6 +89,7 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('foobarfoo (PT-PT)', $translator->trans('foobarfoo'));
         $this->assertEquals('other choice 1 (PT-BR)', $translator->transChoice('other choice', 1));
         $this->assertEquals('foobarbaz (fr.UTF-8)', $translator->trans('foobarbaz'));
+        $this->assertEquals('foobarbax (sr@latin)', $translator->trans('foobarbax'));
     }
 
     public function testGetLocale()
@@ -185,6 +188,13 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
                 'foobarbaz' => 'foobarbaz (fr.UTF-8)',
             ))))
         ;
+        $loader
+            ->expects($this->at(6))
+            ->method('load')
+            ->will($this->returnValue($this->getCatalogue('sr@latin', array(
+                'foobarbax' => 'foobarbax (sr@latin)',
+            ))))
+        ;
 
         return $loader;
     }
@@ -216,6 +226,7 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         $translator->addResource('loader', 'foo', 'pt-PT'); // European Portuguese
         $translator->addResource('loader', 'foo', 'pt_BR'); // Brazilian Portuguese
         $translator->addResource('loader', 'foo', 'fr.UTF-8');
+        $translator->addResource('loader', 'foo', 'sr@latin'); // Latin Serbian
 
         return $translator;
     }
diff --git a/src/Symfony/Component/Translation/Tests/TranslatorTest.php b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
index 40a0b1d0d9..cf9c8df659 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
@@ -103,7 +103,6 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('bar (fr)', $translator->trans('bar'));
     }
 
-
     /**
      * @dataProvider      getInvalidLocalesTests
      * @expectedException \InvalidArgumentException
@@ -329,7 +328,6 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         // no assertion. this method just asserts that no exception is thrown
     }
 
-
     public function getTransFileTests()
     {
         return array(
@@ -429,6 +427,7 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
             array('fr_FR'),
             array('fr.FR'),
             array('fr-FR.UTF8'),
+            array('sr@latin'),
         );
     }
 
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index e54b300ffd..8e3cda857c 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -308,7 +308,7 @@ class Translator implements TranslatorInterface
      */
     private function assertValidLocale($locale)
     {
-        if (0 !== preg_match('/[^a-z0-9_\\.\\-]+/i', $locale, $match)) {
+        if (0 !== preg_match('/[^a-z0-9@_\\.\\-]+/i', $locale, $match)) {
             throw new \InvalidArgumentException(sprintf('Invalid locale: %s.', $locale));
         }
     }