diff --git a/tests/Composer/Test/Installer/LibraryInstallerTest.php b/tests/Composer/Test/Installer/LibraryInstallerTest.php
index d8713aa38..b8134763a 100644
--- a/tests/Composer/Test/Installer/LibraryInstallerTest.php
+++ b/tests/Composer/Test/Installer/LibraryInstallerTest.php
@@ -28,13 +28,13 @@ class LibraryInstallerTest extends \PHPUnit_Framework_TestCase
     {
         $fs = new Filesystem;
 
-        $this->vendorDir = realpath(sys_get_temp_dir().DIRECTORY_SEPARATOR.'composer-test-vendor');
+        $this->vendorDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'composer-test-vendor';
         if (is_dir($this->vendorDir)) {
             $fs->removeDirectory($this->vendorDir);
         }
         mkdir($this->vendorDir);
 
-        $this->binDir = realpath(sys_get_temp_dir().DIRECTORY_SEPARATOR.'composer-test-bin');
+        $this->binDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'composer-test-bin';
         if (is_dir($this->binDir)) {
             $fs->removeDirectory($this->binDir);
         }