diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index 2bfb2441e1..35d48ed081 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -23,6 +23,7 @@ use Symfony\Component\Process\ProcessPipes;
 class ProcessTest extends \PHPUnit_Framework_TestCase
 {
     private static $phpBin;
+    private static $process;
     private static $sigchild;
     private static $notEnhancedSigchild = false;
 
@@ -42,6 +43,14 @@ class ProcessTest extends \PHPUnit_Framework_TestCase
         self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
     }
 
+    protected function tearDown()
+    {
+        if (self::$process) {
+            self::$process->stop(0);
+            self::$process = null;
+        }
+    }
+
     public function testThatProcessDoesNotThrowWarningDuringRun()
     {
         @trigger_error('Test Error', E_USER_NOTICE);
@@ -122,9 +131,9 @@ class ProcessTest extends \PHPUnit_Framework_TestCase
         $h = new \ReflectionProperty($p, 'process');
         $h->setAccessible(true);
         $h = $h->getValue($p);
-        $s = proc_get_status($h);
+        $s = @proc_get_status($h);
 
-        while ($s['running']) {
+        while (!empty($s['running'])) {
             usleep(1000);
             $s = proc_get_status($h);
         }
@@ -1012,7 +1021,11 @@ class ProcessTest extends \PHPUnit_Framework_TestCase
             }
         }
 
-        return $process;
+        if (self::$process) {
+            self::$process->stop(0);
+        }
+
+        return self::$process = $process;
     }
 
     private function skipIfNotEnhancedSigchild($expectException = true)