diff --git a/build/phar-autoload.php.in b/build/phar-autoload.php.in
index 5cef95805bb..e9b53d0cf03 100644
--- a/build/phar-autoload.php.in
+++ b/build/phar-autoload.php.in
@@ -21,6 +21,7 @@ spl_autoload_register(
   }
 );
 
+Phar::mapPhar('___PHAR___');
 PHPUnit_TextUI_Command::main();
 
 __HALT_COMPILER();