diff --git a/snappymail/v/0.0.0/setup.php b/snappymail/v/0.0.0/setup.php
index 1f460b1f9..c219f6cf3 100644
--- a/snappymail/v/0.0.0/setup.php
+++ b/snappymail/v/0.0.0/setup.php
@@ -34,6 +34,7 @@ $aRequirements = array(
 	'mbstring' => extension_loaded('mbstring'),
 	'Zlib'     => extension_loaded('zlib'),
 	// enabled by default:
+	'ctype'    => extension_loaded('ctype'),
 	'json'     => function_exists('json_decode'),
 	'libxml'   => function_exists('libxml_use_internal_errors'),
 	'dom'      => class_exists('DOMDocument')