diff --git a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
index 76920d374d..ca52ede567 100644
--- a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
+++ b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
@@ -18,7 +18,7 @@ namespace Symfony\Component\ClassLoader;
  */
 class ClassCollectionLoader
 {
-    static protected $loaded;
+    static private $loaded;
 
     /**
      * Loads a list of classes and caches them in one big file.
@@ -174,8 +174,7 @@ class ClassCollectionLoader
      *
      * @throws \RuntimeException when a cache file cannot be written
      */
-     
-    static protected function writeCacheFile($file, $content)
+    static private function writeCacheFile($file, $content)
     {
         $tmpFile = tempnam(dirname($file), basename($file));
         if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $file)) {
@@ -197,7 +196,7 @@ class ClassCollectionLoader
      *
      * @return string The PHP string with the comments removed
      */
-    static protected function stripComments($source)
+    static private function stripComments($source)
     {
         if (!function_exists('token_get_all')) {
             return $source;
diff --git a/src/Symfony/Component/ClassLoader/MapFileClassLoader.php b/src/Symfony/Component/ClassLoader/MapFileClassLoader.php
index 3172445bda..e1060b8b04 100644
--- a/src/Symfony/Component/ClassLoader/MapFileClassLoader.php
+++ b/src/Symfony/Component/ClassLoader/MapFileClassLoader.php
@@ -18,7 +18,7 @@ namespace Symfony\Component\ClassLoader;
  */
 class MapFileClassLoader
 {
-    protected $map = array();
+    private $map = array();
 
     /**
      * Constructor.
diff --git a/src/Symfony/Component/ClassLoader/UniversalClassLoader.php b/src/Symfony/Component/ClassLoader/UniversalClassLoader.php
index 5f27c32f3c..822023705f 100644
--- a/src/Symfony/Component/ClassLoader/UniversalClassLoader.php
+++ b/src/Symfony/Component/ClassLoader/UniversalClassLoader.php
@@ -54,10 +54,10 @@ namespace Symfony\Component\ClassLoader;
  */
 class UniversalClassLoader
 {
-    protected $namespaces = array();
-    protected $prefixes = array();
-    protected $namespaceFallback = array();
-    protected $prefixFallback = array();
+    private $namespaces = array();
+    private $prefixes = array();
+    private $namespaceFallback = array();
+    private $prefixFallback = array();
 
     /**
      * Gets the configured namespaces.