diff --git a/src/Composer/Downloader/FileDownloader.php b/src/Composer/Downloader/FileDownloader.php
index 676b2977e..894429c97 100644
--- a/src/Composer/Downloader/FileDownloader.php
+++ b/src/Composer/Downloader/FileDownloader.php
@@ -364,7 +364,7 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
         $self = $this;
         $io = $this->io;
 
-        return $promise->then(function () use ($self, $target, $path, $io) {
+        return $promise->then(function () use ($self, $target, $path) {
             $promise = $self->install($target, $path, false);
 
             return $promise;