diff --git a/src/Composer/Downloader/GitDownloader.php b/src/Composer/Downloader/GitDownloader.php
index 0552c077f..35836cc7d 100644
--- a/src/Composer/Downloader/GitDownloader.php
+++ b/src/Composer/Downloader/GitDownloader.php
@@ -62,7 +62,7 @@ class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface
     {
         GitUtil::cleanEnv();
 
-        $cachePath = $this->config->get('cache-vcs-dir').'/'.Preg::replace('{[^a-z0-9.]}i', '-', $url).'/';
+        $cachePath = $this->config->get('cache-vcs-dir').'/'.Preg::replace('{[^a-z0-9.]}i', '-', Url::sanitize($url)).'/';
         $gitVersion = GitUtil::getVersion($this->process);
 
         // --dissociate option is only available since git 2.3.0-rc0
@@ -87,7 +87,7 @@ class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface
     {
         GitUtil::cleanEnv();
         $path = $this->normalizePath($path);
-        $cachePath = $this->config->get('cache-vcs-dir').'/'.Preg::replace('{[^a-z0-9.]}i', '-', $url).'/';
+        $cachePath = $this->config->get('cache-vcs-dir').'/'.Preg::replace('{[^a-z0-9.]}i', '-', Url::sanitize($url)).'/';
         $ref = $package->getSourceReference();
         $flag = Platform::isWindows() ? '/D ' : '';
 
@@ -156,7 +156,7 @@ class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface
             throw new \RuntimeException('The .git directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
         }
 
-        $cachePath = $this->config->get('cache-vcs-dir').'/'.Preg::replace('{[^a-z0-9.]}i', '-', $url).'/';
+        $cachePath = $this->config->get('cache-vcs-dir').'/'.Preg::replace('{[^a-z0-9.]}i', '-', Url::sanitize($url)).'/';
         $ref = $target->getSourceReference();
 
         if (!empty($this->cachedPackages[$target->getId()][$ref])) {
diff --git a/src/Composer/Repository/Vcs/GitDriver.php b/src/Composer/Repository/Vcs/GitDriver.php
index 039f9052f..f11d40889 100644
--- a/src/Composer/Repository/Vcs/GitDriver.php
+++ b/src/Composer/Repository/Vcs/GitDriver.php
@@ -52,7 +52,7 @@ class GitDriver extends VcsDriver
                 throw new \RuntimeException('GitDriver requires a usable cache directory, and it looks like you set it to be disabled');
             }
 
-            $this->repoDir = $this->config->get('cache-vcs-dir') . '/' . Preg::replace('{[^a-z0-9.]}i', '-', $this->url) . '/';
+            $this->repoDir = $this->config->get('cache-vcs-dir') . '/' . Preg::replace('{[^a-z0-9.]}i', '-', Url::sanitize($this->url)) . '/';
 
             GitUtil::cleanEnv();
 
diff --git a/src/Composer/Repository/Vcs/HgDriver.php b/src/Composer/Repository/Vcs/HgDriver.php
index f9f8064ba..815648945 100644
--- a/src/Composer/Repository/Vcs/HgDriver.php
+++ b/src/Composer/Repository/Vcs/HgDriver.php
@@ -19,6 +19,7 @@ use Composer\Util\Hg as HgUtils;
 use Composer\Util\ProcessExecutor;
 use Composer\Util\Filesystem;
 use Composer\IO\IOInterface;
+use Composer\Util\Url;
 
 /**
  * @author Per Bernhardt <plb@webfactory.de>
@@ -47,7 +48,7 @@ class HgDriver extends VcsDriver
             }
 
             $cacheDir = $this->config->get('cache-vcs-dir');
-            $this->repoDir = $cacheDir . '/' . Preg::replace('{[^a-z0-9]}i', '-', $this->url) . '/';
+            $this->repoDir = $cacheDir . '/' . Preg::replace('{[^a-z0-9]}i', '-', Url::sanitize($this->url)) . '/';
 
             $fs = new Filesystem();
             $fs->ensureDirectoryExists($cacheDir);