diff --git a/src/Symfony/Component/Process/Tests/AbstractProcessTest.php b/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
index c5737e1a9e..19e841bbaa 100644
--- a/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
@@ -80,7 +80,7 @@ abstract class AbstractProcessTest extends \PHPUnit_Framework_TestCase
         }
         $duration = microtime(true) - $start;
 
-        $this->assertLessThan(1.8, $duration);
+        $this->assertLessThan(4, $duration);
     }
 
     public function testAllOutputIsActuallyReadOnTermination()