diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index d5246daaeb..ff1f8a2a7b 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -1024,6 +1024,10 @@ class Process
             return self::$sigchild;
         }
 
+        if (!function_exists('phpinfo')) {
+            return self::$sigchild = false;
+        }
+
         ob_start();
         phpinfo(INFO_GENERAL);