diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index 02a90c9969..223e116090 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -368,25 +368,28 @@ class Filesystem
             $startPath = str_replace('\\', '/', $startPath);
         }
 
+        $stripDriveLetter = function ($path) {
+            if (strlen($path) > 2 && ':' === $path[1] && '/' === $path[2] && ctype_alpha($path[0])) {
+                return substr($path, 2);
+            }
+
+            return $path;
+        };
+
+        $endPath = $stripDriveLetter($endPath);
+        $startPath = $stripDriveLetter($startPath);
+
         // Split the paths into arrays
         $startPathArr = explode('/', trim($startPath, '/'));
         $endPathArr = explode('/', trim($endPath, '/'));
 
-        if ('/' !== $startPath[0]) {
-            array_shift($startPathArr);
-        }
-
-        if ('/' !== $endPath[0]) {
-            array_shift($endPathArr);
-        }
-
-        $normalizePathArray = function ($pathSegments) {
+        $normalizePathArray = function ($pathSegments, $absolute) {
             $result = array();
 
             foreach ($pathSegments as $segment) {
-                if ('..' === $segment) {
+                if ('..' === $segment && ($absolute || count($result))) {
                     array_pop($result);
-                } else {
+                } elseif ('.' !== $segment) {
                     $result[] = $segment;
                 }
             }
@@ -394,8 +397,8 @@ class Filesystem
             return $result;
         };
 
-        $startPathArr = $normalizePathArray($startPathArr);
-        $endPathArr = $normalizePathArray($endPathArr);
+        $startPathArr = $normalizePathArray($startPathArr, static::isAbsolutePath($startPath));
+        $endPathArr = $normalizePathArray($endPathArr, static::isAbsolutePath($endPath));
 
         // Find for which directory the common path stops
         $index = 0;
@@ -410,13 +413,8 @@ class Filesystem
             $depth = count($startPathArr) - $index;
         }
 
-        // When we need to traverse from the start, and we are starting from a root path, don't add '../'
-        if ('/' === $startPath[0] && 0 === $index && 0 === $depth) {
-            $traverser = '';
-        } else {
-            // Repeated "../" for each level need to reach the common path
-            $traverser = str_repeat('../', $depth);
-        }
+        // Repeated "../" for each level need to reach the common path
+        $traverser = str_repeat('../', $depth);
 
         $endPathRemainder = implode('/', array_slice($endPathArr, $index));
 
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
index a4d111c218..1228b2d8e2 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
@@ -850,6 +850,7 @@ class FilesystemTest extends FilesystemTestCase
             array('/var/lib/symfony/src/Symfony', '/var/lib/symfony/src/Symfony/Component/', '../'),
             array('var/lib/symfony/', 'var/lib/symfony/src/Symfony/Component', '../../../'),
             array('/usr/lib/symfony/', '/var/lib/symfony/src/Symfony/Component', '../../../../../../usr/lib/symfony/'),
+            array('usr/lib/symfony/', 'var/lib/symfony/src/Symfony/Component', '../../../../../../usr/lib/symfony/'),
             array('/var/lib/symfony/src/Symfony/', '/var/lib/symfony/', 'src/Symfony/'),
             array('/aa/bb', '/aa/bb', './'),
             array('/aa/bb', '/aa/bb/', './'),
@@ -881,6 +882,17 @@ class FilesystemTest extends FilesystemTestCase
             array('C:/aa/bb/../../cc', 'C:/aa/../dd/..', 'cc/'),
             array('C:/../aa/bb/cc', 'C:/aa/dd/..', 'bb/cc/'),
             array('C:/../../aa/../bb/cc', 'C:/aa/dd/..', '../bb/cc/'),
+            array('aa/bb', 'aa/cc', '../bb/'),
+            array('aa/cc', 'bb/cc', '../../aa/cc/'),
+            array('aa/bb', 'aa/./cc', '../bb/'),
+            array('aa/./bb', 'aa/cc', '../bb/'),
+            array('aa/./bb', 'aa/./cc', '../bb/'),
+            array('../../', '../../', './'),
+            array('../aa/bb/', 'aa/bb/', '../../../aa/bb/'),
+            array('../../../', '../../', '../'),
+            array('', '', './'),
+            array('', 'aa/', '../'),
+            array('aa/', '', 'aa/'),
         );
 
         if ('\\' === DIRECTORY_SEPARATOR) {