Index: modules/setup/application/clicommands/ConfigCommand.php
--- modules/setup/application/clicommands/ConfigCommand.php.orig
+++ modules/setup/application/clicommands/ConfigCommand.php
@@ -24,7 +24,7 @@ class ConfigCommand extends Command
      *
      *  --mode=<mode>           The access mode to use [2770]
      *
-     *  --group=<group>         Owner group for the configuration directory [icingaweb2]
+     *  --group=<group>         Owner group for the configuration directory [_icingaweb2]
      *
      * EXAMPLES:
      *
@@ -41,7 +41,7 @@ class ConfigCommand extends Command
             ));
         }
 
-        $group = trim($this->params->get('group', 'icingaweb2'));
+        $group = trim($this->params->get('group', '_icingaweb2'));
         if (strlen($group) === 0) {
             $this->fail($this->translate(
                 'The argument --group expects a owner group for the configuration directory'
