diff --git a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php b/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
index 7071cf2c16..2982aff9f9 100644
--- a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
@@ -41,6 +41,7 @@ class ProcessBuilderTest extends \PHPUnit_Framework_TestCase
             ->add('command')
             ->setEnv('foo', 'bar2')
             ->addEnvironmentVariables($env)
+            ->inheritEnvironmentVariables(false)
             ->getProcess()
         ;