diff --git a/lib/os/class.ISPConfigDebianOS.inc.php b/lib/os/class.ISPConfigDebianOS.inc.php
index 47aee977740222680c806906cee3b5c716a1a096..996bd9a608de14abc964f6d6c78e8618e1ef5e9a 100644
--- a/lib/os/class.ISPConfigDebianOS.inc.php
+++ b/lib/os/class.ISPConfigDebianOS.inc.php
@@ -322,7 +322,7 @@ class ISPConfigDebianOS extends ISPConfigBaseOS {
 		$unattendedupgrades_options = ISPConfig::getUnattendedUpgradesOptions();
 		if (!empty($unattendedupgrades_options)) {
 			if (in_array("autoclean", $unattendedupgrades_options)) {
-				$unattendedupgrades = "\n" . 'UnattendedUpgrades: APT::Periodic::AutocleanInterval "7";'  . "\n" . 'Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";'  . "\n" . 'Unattended-Upgrade::Remove-Unused-Dependencies "true";';
+				$unattendedupgrades = "\n" . 'APT::Periodic::AutocleanInterval "7";'  . "\n" . 'Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";'  . "\n" . 'Unattended-Upgrade::Remove-Unused-Dependencies "true";';
 				file_put_contents('/etc/apt/apt.conf.d/20auto-upgrades', $unattendedupgrades, FILE_APPEND | LOCK_EX);
 			}
 			if (in_array("reboot", $unattendedupgrades_options)) {