diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index d83b27330c30..dd3d8b471edc 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -569,14 +569,15 @@ public function mirror($originDir, $targetDir, \Traversable $iterator = null, $o
         }
 
         $this->mkdir($targetDir);
-        $targetDirInfo = new \SplFileInfo($targetDir);
+        $filesCreatedWhileMirroring = [];
 
         foreach ($iterator as $file) {
-            if ($file->getPathname() === $targetDir || $file->getRealPath() === $targetDir || 0 === strpos($file->getRealPath(), $targetDirInfo->getRealPath())) {
+            if ($file->getPathname() === $targetDir || $file->getRealPath() === $targetDir || isset($filesCreatedWhileMirroring[$file->getRealPath()])) {
                 continue;
             }
 
             $target = $targetDir.substr($file->getPathname(), $originDirLen);
+            $filesCreatedWhileMirroring[$target] = true;
 
             if (!$copyOnWindows && is_link($file)) {
                 $this->symlink($file->getLinkTarget(), $target);