diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index e91c59e091..7b25b556bc 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -747,7 +747,7 @@ class ProcessTest extends \PHPUnit_Framework_TestCase
         }
         $this->skipIfNotEnhancedSigchild(false);
 
-        $process = $this->getProcess(self::$phpBin.' -r "while (true) usleep(100);"');
+        $process = $this->getProcess(self::$phpBin.' -r "sleep(32.1)"');
         $process->start();
         posix_kill($process->getPid(), 9); // SIGKILL
 
@@ -831,9 +831,8 @@ class ProcessTest extends \PHPUnit_Framework_TestCase
             $this->fail('A RuntimeException should have been raised');
         } catch (RuntimeException $e) {
         }
-        $duration = microtime(true) - $start;
 
-        $this->assertLessThan(3, $duration);
+        $this->assertLessThan(15, microtime(true) - $start);
 
         throw $e;
     }