diff --git a/setup/inc/class.setup_cmd_config.inc.php b/setup/inc/class.setup_cmd_config.inc.php
index a0f1ae0829..50e00a0893 100644
--- a/setup/inc/class.setup_cmd_config.inc.php
+++ b/setup/inc/class.setup_cmd_config.inc.php
@@ -454,7 +454,7 @@ class setup_cmd_config extends setup_cmd
 			foreach(scandir(EGW_INCLUDE_ROOT.'/api/src/Auth') as $file)
 			{
 				$matches = null;
-				if (preg_match('/^([a-z0-9]+)\.php$/', $file, $matches) &&
+				if (preg_match('/^([a-z0-9]+)\.php$/i', $file, $matches) &&
 					!isset($auth_types[strtolower($matches[1])]) && $matches[1] != 'Backend')
 				{
 					$auth_types[strtolower($matches[1])] = $matches[1];