diff --git a/src/Composer/Autoload/AutoloadGenerator.php b/src/Composer/Autoload/AutoloadGenerator.php
index 59addd0b4..036b40b95 100644
--- a/src/Composer/Autoload/AutoloadGenerator.php
+++ b/src/Composer/Autoload/AutoloadGenerator.php
@@ -61,12 +61,16 @@ EOF;
         $relVendorPath = $filesystem->findShortestPath(getcwd(), $vendorPath);
         $vendorDirCode = $filesystem->findShortestPathCode(realpath($targetDir), $vendorPath, true);
 
+        $appBaseDir = $filesystem->findShortestPathCode($vendorPath, getcwd(), true);
+        $appBaseDir = str_replace('__DIR__', '$vendorDir', $appBaseDir);
+
         $namespacesFile = <<<EOF
 <?php
 
 // autoload_namespace.php generated by Composer
 
 \$vendorDir = $vendorDirCode;
+\$baseDir = $appBaseDir;
 
 return array(
 
@@ -75,56 +79,65 @@ EOF;
         $packageMap = $this->buildPackageMap($installationManager, $mainPackage, $localRepo->getPackages());
         $autoloads = $this->parseAutoloads($packageMap);
 
-        $appBaseDir = $filesystem->findShortestPathCode($vendorPath, getcwd(), true);
-        $appBaseDir = str_replace('__DIR__', '$vendorDir', $appBaseDir);
-
-        if (isset($autoloads['psr-0'])) {
-            foreach ($autoloads['psr-0'] as $namespace => $paths) {
-                $exportedPaths = array();
-                foreach ($paths as $path) {
-                    $path = strtr($path, '\\', '/');
-                    $baseDir = '';
-                    if (!$filesystem->isAbsolutePath($path)) {
-                        // vendor dir == working dir
-                        if (preg_match('{^(\./?)?$}', $relVendorPath)) {
-                            $path = '/'.$path;
-                            $baseDir = '$vendorDir . ';
-                        } elseif (strpos($path, $relVendorPath) === 0) {
-                            // path starts with vendor dir
-                            $path = substr($path, strlen($relVendorPath));
-                            $baseDir = '$vendorDir . ';
-                        } else {
-                            $path = '/'.$path;
-                            $baseDir = $appBaseDir . ' . ';
-                        }
-                    } elseif (strpos($path, $vendorPath) === 0) {
-                        $path = substr($path, strlen($vendorPath));
+        foreach ($autoloads['psr-0'] as $namespace => $paths) {
+            $exportedPaths = array();
+            foreach ($paths as $path) {
+                $path = strtr($path, '\\', '/');
+                $baseDir = '';
+                if (!$filesystem->isAbsolutePath($path)) {
+                    // vendor dir == working dir
+                    if (preg_match('{^(\./?)?$}', $relVendorPath)) {
+                        $path = '/'.$path;
                         $baseDir = '$vendorDir . ';
+                    } elseif (strpos($path, $relVendorPath) === 0) {
+                        // path starts with vendor dir
+                        $path = substr($path, strlen($relVendorPath));
+                        $baseDir = '$vendorDir . ';
+                    } else {
+                        $path = '/'.$path;
+                        $baseDir = '$baseDir . ';
                     }
-                    $exportedPaths[] = $baseDir.var_export($path, true);
-                }
-                $exportedPrefix = var_export($namespace, true);
-                $namespacesFile .= "    $exportedPrefix => ";
-                if (count($exportedPaths) > 1) {
-                    $namespacesFile .= "array(".implode(', ',$exportedPaths)."),\n";
-                } else {
-                    $namespacesFile .= $exportedPaths[0].",\n";
+                } elseif (strpos($path, $vendorPath) === 0) {
+                    $path = substr($path, strlen($vendorPath));
+                    $baseDir = '$vendorDir . ';
                 }
+                $exportedPaths[] = $baseDir.var_export($path, true);
+            }
+            $exportedPrefix = var_export($namespace, true);
+            $namespacesFile .= "    $exportedPrefix => ";
+            if (count($exportedPaths) > 1) {
+                $namespacesFile .= "array(".implode(', ', $exportedPaths)."),\n";
+            } else {
+                $namespacesFile .= $exportedPaths[0].",\n";
             }
         }
         $namespacesFile .= ");\n";
 
-        if (isset($autoloads['classmap'])) {
-            // flatten array
-            $autoloads['classmap'] = new \RecursiveIteratorIterator(new \RecursiveArrayIterator($autoloads['classmap']));
-        } else {
-            $autoloads['classmap'] = array();
-        }
+        $classmapFile = <<<EOF
+<?php
 
-        ClassMapGenerator::dump($autoloads['classmap'], $targetDir.'/autoload_classmap.php');
+// autoload_classmap.php generated by Composer
+
+\$vendorDir = $vendorDirCode;
+\$baseDir = $appBaseDir;
+
+return array(
+
+EOF;
+
+        // flatten array
+        $autoloads['classmap'] = new \RecursiveIteratorIterator(new \RecursiveArrayIterator($autoloads['classmap']));
+        foreach ($autoloads['classmap'] as $dir) {
+            foreach (ClassMapGenerator::createMap($dir) as $class => $path) {
+                $path = '/'.$filesystem->findShortestPath(getcwd(), $path);
+                $classmapFile .= '    '.var_export($class, true).' => $baseDir . '.var_export($path, true).",\n";
+            }
+        }
+        $classmapFile .= ");\n";
 
         file_put_contents($targetDir.'/autoload.php', $autoloadFile);
         file_put_contents($targetDir.'/autoload_namespaces.php', $namespacesFile);
+        file_put_contents($targetDir.'/autoload_classmap.php', $classmapFile);
         copy(__DIR__.'/ClassLoader.php', $targetDir.'/ClassLoader.php');
     }
 
@@ -154,7 +167,7 @@ EOF;
      */
     public function parseAutoloads(array $packageMap)
     {
-        $autoloads = array();
+        $autoloads = array('classmap' => array(), 'psr-0' => array());
         foreach ($packageMap as $item) {
             list($package, $installPath) = $item;
 
diff --git a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
index 123faa5c5..9d2d243a9 100644
--- a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
+++ b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
@@ -160,11 +160,12 @@ class AutoloadGeneratorTest extends TestCase
         file_put_contents($this->vendorDir.'/b/b/lib/c.php', '<?php class ClassMapBaz {}');
 
         $this->generator->dump($this->repository, $package, $this->im, $this->vendorDir.'/.composer');
-        $this->assertTrue(file_exists($this->vendorDir.'/.composer/autoload_classmap.php'), "ClassMap file needs to be generated, even if empty.");
-        $this->assertEquals(array(
-                'ClassMapFoo' => $this->vendorDir.'/a/a/src/a.php',
-                'ClassMapBar' => $this->vendorDir.'/b/b/src/b.php',
-                'ClassMapBaz' => $this->vendorDir.'/b/b/lib/c.php',
+        $this->assertTrue(file_exists($this->vendorDir.'/.composer/autoload_classmap.php'), "ClassMap file needs to be generated.");
+        $this->assertEquals(
+            array(
+                'ClassMapFoo' => $this->workingDir.'/composer-test-autoload/a/a/src/a.php',
+                'ClassMapBar' => $this->workingDir.'/composer-test-autoload/b/b/src/b.php',
+                'ClassMapBaz' => $this->workingDir.'/composer-test-autoload/b/b/lib/c.php',
             ),
             include ($this->vendorDir.'/.composer/autoload_classmap.php')
         );
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_main.php b/tests/Composer/Test/Autoload/Fixtures/autoload_main.php
index 157d888f3..ec243e33e 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_main.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_main.php
@@ -3,8 +3,9 @@
 // autoload_namespace.php generated by Composer
 
 $vendorDir = dirname(__DIR__);
+$baseDir = dirname($vendorDir);
 
 return array(
-    'Main' => dirname($vendorDir) . '/src/',
-    'Lala' => dirname($vendorDir) . '/src/',
+    'Main' => $baseDir . '/src/',
+    'Lala' => $baseDir . '/src/',
 );
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_main2.php b/tests/Composer/Test/Autoload/Fixtures/autoload_main2.php
index a0fa2c7db..da1c87d88 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_main2.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_main2.php
@@ -3,8 +3,9 @@
 // autoload_namespace.php generated by Composer
 
 $vendorDir = dirname(__DIR__);
+$baseDir = dirname(dirname($vendorDir));
 
 return array(
-    'Main' => dirname(dirname($vendorDir)) . '/src/',
-    'Lala' => dirname(dirname($vendorDir)) . '/src/',
+    'Main' => $baseDir . '/src/',
+    'Lala' => $baseDir . '/src/',
 );
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_main3.php b/tests/Composer/Test/Autoload/Fixtures/autoload_main3.php
index 6f12b3d75..3c6d910cc 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_main3.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_main3.php
@@ -3,6 +3,7 @@
 // autoload_namespace.php generated by Composer
 
 $vendorDir = dirname(__DIR__);
+$baseDir = dirname($vendorDir);
 
 return array(
     'Main' => $vendorDir . '/src/',
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_override_vendors.php b/tests/Composer/Test/Autoload/Fixtures/autoload_override_vendors.php
index 4b4eacdca..0640aceda 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_override_vendors.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_override_vendors.php
@@ -3,6 +3,7 @@
 // autoload_namespace.php generated by Composer
 
 $vendorDir = dirname(__DIR__);
+$baseDir = dirname($vendorDir);
 
 return array(
     'B\\Sub\\Name' => $vendorDir . '/b/b/src/',
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_vendors.php b/tests/Composer/Test/Autoload/Fixtures/autoload_vendors.php
index b149046df..dd076486d 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_vendors.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_vendors.php
@@ -3,6 +3,7 @@
 // autoload_namespace.php generated by Composer
 
 $vendorDir = dirname(__DIR__);
+$baseDir = dirname($vendorDir);
 
 return array(
     'B\\Sub\\Name' => $vendorDir . '/b/b/src/',