diff --git a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
index c632849e53..8e835d8beb 100644
--- a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
+++ b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
@@ -19,6 +19,7 @@ namespace Symfony\Component\ClassLoader;
 class ClassCollectionLoader
 {
     private static $loaded;
+    private static $useTokenizer = true;
 
     /**
      * Loads a list of classes and caches them in one big file.
@@ -125,7 +126,11 @@ class ClassCollectionLoader
      */
     public static function fixNamespaceDeclarations($source)
     {
-        if (!function_exists('token_get_all')) {
+        if (!function_exists('token_get_all') || !self::$useTokenizer) {
+            if (preg_match('/namespace(.*?)\s*;/', $source)) {
+                $source = preg_replace('/namespace(.*?)(\s*);/', "namespace$1$2\n{", $source)."}\n";
+            }
+
             return $source;
         }
 
@@ -219,4 +224,12 @@ class ClassCollectionLoader
 
         return $output;
     }
+
+    /**
+     * This method is only useful for testing.
+     */
+    public static function enableTokenizer($bool)
+    {
+        self::$useTokenizer = (Boolean) $bool;
+    }
 }
diff --git a/tests/Symfony/Tests/Component/ClassLoader/ClassCollectionLoaderTest.php b/tests/Symfony/Tests/Component/ClassLoader/ClassCollectionLoaderTest.php
index ed0b7b96fa..609928da16 100644
--- a/tests/Symfony/Tests/Component/ClassLoader/ClassCollectionLoaderTest.php
+++ b/tests/Symfony/Tests/Component/ClassLoader/ClassCollectionLoaderTest.php
@@ -15,53 +15,34 @@ use Symfony\Component\ClassLoader\ClassCollectionLoader;
 
 class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
 {
-    public function testFixNamespaceDeclarations()
+    /**
+     * @dataProvider getFixNamespaceDeclarationsData
+     */
+    public function testFixNamespaceDeclarations($source, $expected)
     {
-        $source = <<<EOF
-<?php
+        $this->assertEquals('<?php '.$expected, ClassCollectionLoader::fixNamespaceDeclarations('<?php '.$source));
+    }
 
-namespace Foo;
-class Foo {}
-namespace   Bar ;
-class Foo {}
-namespace Foo\Bar;
-class Foo {}
-namespace Foo\Bar\Bar
-{
-    class Foo {}
-}
-namespace
-{
-    class Foo {}
-}
-EOF;
+    /**
+     * @dataProvider getFixNamespaceDeclarationsData
+     */
+    public function testFixNamespaceDeclarationsWithoutTokenizer($source, $expected)
+    {
+        ClassCollectionLoader::enableTokenizer(false);
+        $this->assertEquals('<?php '.$expected, ClassCollectionLoader::fixNamespaceDeclarations('<?php '.$source));
+        ClassCollectionLoader::enableTokenizer(true);
+    }
 
-        $expected = <<<EOF
-<?php
-
-namespace Foo
-{
-class Foo {}
-}
-namespace   Bar 
-{
-class Foo {}
-}
-namespace Foo\Bar
-{
-class Foo {}
-}
-namespace Foo\Bar\Bar
-{
-    class Foo {}
-}
-namespace
-{
-    class Foo {}
-}
-EOF;
-
-        $this->assertEquals($expected, ClassCollectionLoader::fixNamespaceDeclarations($source));
+    public function getFixNamespaceDeclarationsData()
+    {
+        return array(
+            array("namespace;\nclass Foo {}\n", "namespace\n{\nclass Foo {}\n}\n"),
+            array("namespace Foo;\nclass Foo {}\n", "namespace Foo\n{\nclass Foo {}\n}\n"),
+            array("namespace   Bar ;\nclass Foo {}\n", "namespace   Bar \n{\nclass Foo {}\n}\n"),
+            array("namespace Foo\Bar;\nclass Foo {}\n", "namespace Foo\Bar\n{\nclass Foo {}\n}\n"),
+            array("namespace Foo\Bar\Bar\n{\nclass Foo {}\n}\n", "namespace Foo\Bar\Bar\n{\nclass Foo {}\n}\n"),
+            array("namespace\n{\nclass Foo {}\n}\n", "namespace\n{\nclass Foo {}\n}\n"),
+        );
     }
 
     /**