diff --git a/CHANGELOG b/CHANGELOG
index e4a02f10c48..d8ec2412723 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,7 @@ CHANGELOG Roundcube Webmail
 - Managesieve: Fix handling of scripts with nested rules (#5540)
 - Fix variable substitution in ldap host for some use-cases, e.g. new_user_identity (#5544)
 - Enigma: Fix PHP fatal error when decrypting a message with invalid signature (#5555)
+- Enigma: Fix missing require statement for Crypt_GPG_KeyGenerator (#5641)
 - Fix adding images to new identity signatures
 - Fix rsync error handling in installto.sh script (#5562)
 - Fix some advanced search issues with multiple addressbooks (#5572)
diff --git a/plugins/enigma/lib/enigma_driver_gnupg.php b/plugins/enigma/lib/enigma_driver_gnupg.php
index afa54ed2ea6..04e0476cd0b 100644
--- a/plugins/enigma/lib/enigma_driver_gnupg.php
+++ b/plugins/enigma/lib/enigma_driver_gnupg.php
@@ -281,6 +281,8 @@ public function get_key($keyid)
      */
     public function gen_key($data)
     {
+        require_once 'Crypt/GPG/KeyGenerator.php';
+
         try {
             $debug  = $this->rc->config->get('enigma_debug');
             $keygen = new Crypt_GPG_KeyGenerator(array(