diff --git a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
index d1236d6f0..29bb690f8 100644
--- a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
+++ b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
@@ -29,7 +29,7 @@ class AutoloadGeneratorTest extends \PHPUnit_Framework_TestCase
         $fs = new Filesystem;
         $that = $this;
 
-        $this->workingDir = sys_get_temp_dir();
+        $this->workingDir = realpath(sys_get_temp_dir());
         $this->vendorDir = $this->workingDir.DIRECTORY_SEPARATOR.'composer-test-autoload';
         if (is_dir($this->vendorDir)) {
             $fs->removeDirectory($this->vendorDir);
diff --git a/tests/Composer/Test/Installer/LibraryInstallerTest.php b/tests/Composer/Test/Installer/LibraryInstallerTest.php
index 21a43df22..d8713aa38 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 = 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 = 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);
         }