diff --git a/setup/controllers/options.php b/setup/controllers/options.php
index d8e416a5042..86ac8dc0c05 100644
--- a/setup/controllers/options.php
+++ b/setup/controllers/options.php
@@ -56,7 +56,7 @@
 $parser->set('installmode',$installmode);
 
 $files_exist= 0;
-if (file_exists(MODX_INSTALL_PATH . 'manager/index.php') &&
+if (file_exists(MODX_INSTALL_PATH . MODX_MANAGER_URL . '/index.php') &&
     file_exists(MODX_INSTALL_PATH . 'index.php') &&
     file_exists(MODX_INSTALL_PATH . 'connectors/index.php')
 ) {