diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php
index 78468a5b7e..d417357cf3 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php
@@ -34,6 +34,10 @@ class ServerRunCommand extends ContainerAwareCommand
             return false;
         }
 
+        if (!class_exists('Symfony\Component\Process\Process')) {
+            return false;
+        }
+
         return parent::isEnabled();
     }