diff --git a/snappymail/v/0.0.0/app/libraries/snappymail/integrity.php b/snappymail/v/0.0.0/app/libraries/snappymail/integrity.php
index be4e8327f..7b1d301a9 100644
--- a/snappymail/v/0.0.0/app/libraries/snappymail/integrity.php
+++ b/snappymail/v/0.0.0/app/libraries/snappymail/integrity.php
@@ -97,6 +97,7 @@ abstract class Integrity
 	public static function phpExtensions()
 	{
 		$aRequirements = array(
+			'openssl'  => extension_loaded('openssl'),
 			'mbstring' => extension_loaded('mbstring'),
 			'Zlib'     => extension_loaded('zlib'),
 			// enabled by default: