diff --git a/lib/autoloader.php b/lib/autoloader.php
index 54f01d9be9..f592712882 100644
--- a/lib/autoloader.php
+++ b/lib/autoloader.php
@@ -21,26 +21,6 @@ class Autoloader {
 	 */
 	protected $memoryCache;
 
-	/**
-	 * Add a custom prefix to the autoloader
-	 *
-	 * @param string $prefix
-	 * @param string $path
-	 */
-	public function registerPrefix($prefix, $path) {
-		$this->prefixPaths[$prefix] = $path;
-	}
-
-	/**
-	 * Add a custom classpath to the autoloader
-	 *
-	 * @param string $class
-	 * @param string $path
-	 */
-	public function registerClass($class, $path) {
-		$this->classPaths[$class] = $path;
-	}
-
 	/**
 	 * disable the usage of the global classpath \OC::$CLASSPATH
 	 */
@@ -99,14 +79,6 @@ class Autoloader {
 			$paths[] = 'tests/lib/' . strtolower(str_replace('_', '/', substr($class, 5)) . '.php');
 		} elseif (strpos($class, 'Test\\') === 0) {
 			$paths[] = 'tests/lib/' . strtolower(str_replace('\\', '/', substr($class, 5)) . '.php');
-		} else {
-			foreach ($this->prefixPaths as $prefix => $dir) {
-				if (0 === strpos($class, $prefix)) {
-					$path = str_replace('\\', '/', $class) . '.php';
-					$path = str_replace('_', '/', $path);
-					$paths[] = $dir . '/' . $path;
-				}
-			}
 		}
 		return $paths;
 	}
diff --git a/lib/base.php b/lib/base.php
index 4a5f4e77a5..50e415c334 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -447,17 +447,27 @@ class OC {
 		$loaderStart = microtime(true);
 		require_once __DIR__ . '/autoloader.php';
 		self::$loader = new \OC\Autoloader();
-		self::$loader->registerPrefix('Doctrine\\Common', 'doctrine/common/lib');
-		self::$loader->registerPrefix('Doctrine\\DBAL', 'doctrine/dbal/lib');
-		self::$loader->registerPrefix('Symfony\\Component\\Routing', 'symfony/routing');
-		self::$loader->registerPrefix('Symfony\\Component\\Console', 'symfony/console');
-		self::$loader->registerPrefix('Patchwork', '3rdparty');
-		self::$loader->registerPrefix('Pimple', '3rdparty/Pimple');
 		spl_autoload_register(array(self::$loader, 'load'));
 		$loaderEnd = microtime(true);
 
-		// setup the basic server
 		self::initPaths();
+
+		// setup 3rdparty autoloader
+		$vendorAutoLoad = OC::$THIRDPARTYROOT . '/3rdparty/autoload.php';
+		if (file_exists($vendorAutoLoad)) {
+			$loader = require_once $vendorAutoLoad;
+			$loader->add('Pimple',OC::$THIRDPARTYROOT . '/3rdparty/Pimple');
+			$loader->add('Doctrine\\Common',OC::$THIRDPARTYROOT . '/3rdparty/doctrine/common/lib');
+			$loader->add('Doctrine\\DBAL',OC::$THIRDPARTYROOT . '/3rdparty/doctrine/dbal/lib');
+			$loader->add('Symfony\\Component\\Routing',OC::$THIRDPARTYROOT . '/3rdparty/symfony/routing');
+			$loader->add('Symfony\\Component\\Console',OC::$THIRDPARTYROOT . '/3rdparty/symfony/console');
+			$loader->add('Patchwork',OC::$THIRDPARTYROOT . '/3rdparty');
+		} else {
+			OC_Response::setStatus(OC_Response::STATUS_SERVICE_UNAVAILABLE);
+			OC_Template::printErrorPage('Composer autoloader not found, unable to continue.');
+		}
+
+		// setup the basic server
 		self::$server = new \OC\Server();
 		\OC::$server->getEventLogger()->log('autoloader', 'Autoloader', $loaderStart, $loaderEnd);
 		\OC::$server->getEventLogger()->start('boot', 'Initialize');
@@ -494,17 +504,9 @@ class OC {
 		self::handleAuthHeaders();
 		self::registerAutoloaderCache();
 
-
-		OC_Util::isSetLocaleWorking();
-
-		// setup 3rdparty autoloader
-		$vendorAutoLoad = OC::$THIRDPARTYROOT . '/3rdparty/autoload.php';
-		if (file_exists($vendorAutoLoad)) {
-			require_once $vendorAutoLoad;
-		}
-
 		// initialize intl fallback is necessary
 		\Patchwork\Utf8\Bootup::initIntl();
+		OC_Util::isSetLocaleWorking();
 
 		if (!defined('PHPUNIT_RUN')) {
 			OC\Log\ErrorHandler::setLogger(OC_Log::$object);
diff --git a/tests/lib/autoloader.php b/tests/lib/autoloader.php
index 314a8ebee8..4617264724 100644
--- a/tests/lib/autoloader.php
+++ b/tests/lib/autoloader.php
@@ -30,21 +30,6 @@ class AutoLoader extends \PHPUnit_Framework_TestCase {
 		$this->assertEquals(array('private/legacy/files.php', 'private/files.php'), $this->loader->findClass('OC_Files'));
 	}
 
-	public function testClassPath() {
-		$this->loader->registerClass('Foo\Bar', 'foobar.php');
-		$this->assertEquals(array('foobar.php'), $this->loader->findClass('Foo\Bar'));
-	}
-
-	public function testPrefixNamespace() {
-		$this->loader->registerPrefix('Foo', 'foo');
-		$this->assertEquals(array('foo/Foo/Bar.php'), $this->loader->findClass('Foo\Bar'));
-	}
-
-	public function testPrefix() {
-		$this->loader->registerPrefix('Foo_', 'foo');
-		$this->assertEquals(array('foo/Foo/Bar.php'), $this->loader->findClass('Foo_Bar'));
-	}
-
 	public function testLoadTestNamespace() {
 		$this->assertEquals(array('tests/lib/foo/bar.php'), $this->loader->findClass('Test\Foo\Bar'));
 	}