diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index 91634297d8..855015bc6d 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -489,7 +489,7 @@ class Process
      */
     public function isSuccessful()
     {
-        return 0 == $this->getExitCode();
+        return 0 === $this->getExitCode();
     }
 
     /**
diff --git a/src/Symfony/Component/Process/Tests/AbstractProcessTest.php b/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
index 1021746e76..76ea2a64f2 100644
--- a/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
@@ -277,6 +277,18 @@ abstract class AbstractProcessTest extends \PHPUnit_Framework_TestCase
         $this->assertTrue($process->isSuccessful());
     }
 
+    public function testIsSuccessfulOnlyAfterTerminated()
+    {
+        $process = $this->getProcess('sleep 1');
+        $process->start();
+        while ($process->isRunning()) {
+            $this->assertFalse($process->isSuccessful());
+            usleep(300000);
+        }
+
+        $this->assertTrue($process->isSuccessful());
+    }
+
     public function testIsNotSuccessful()
     {
         $process = $this->getProcess('php -r "sleep(4);"');
diff --git a/src/Symfony/Component/Process/Tests/SigchildDisabledProcessTest.php b/src/Symfony/Component/Process/Tests/SigchildDisabledProcessTest.php
index 1e4dc1d0a2..42da0a784c 100644
--- a/src/Symfony/Component/Process/Tests/SigchildDisabledProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/SigchildDisabledProcessTest.php
@@ -80,6 +80,14 @@ class SigchildDisabledProcessTest extends AbstractProcessTest
         parent::testIsSuccessful();
     }
 
+    /**
+     * @expectedException \Symfony\Component\Process\Exception\RuntimeException
+     */
+    public function testIsSuccessfulOnlyAfterTerminated()
+    {
+        parent::testIsSuccessfulOnlyAfterTerminated();
+    }
+
     /**
      * @expectedException \Symfony\Component\Process\Exception\RuntimeException
      */