diff --git a/lib/os/class.ISPConfigDebianOS.inc.php b/lib/os/class.ISPConfigDebianOS.inc.php
index 309971d27cbb89ca0ccfaa9955f4b7a500590496..4c8f87990a5bee30483414e4f26ee17cb7b3f65c 100644
--- a/lib/os/class.ISPConfigDebianOS.inc.php
+++ b/lib/os/class.ISPConfigDebianOS.inc.php
@@ -1551,6 +1551,13 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 		if(ISPConfig::shallInstall('mail') && !ISPConfig::wantsAmavis()) {
 			ISPConfigLog::info('Stopping Rspamd.', true);
 			$this->stopService('rspamd');
+
+			$replacements = array(
+				'/^\s*nrows\s*=.*$/m'           => 'nrows = 2500;',
+				'/^\s*compress\s*=.*$/m'        => 'compress = true;',
+				'/^\s*subject_privacy\s*=.*$/m' => 'subject_privacy = true;',
+			);
+			$this->replaceContents('/etc/rspamd/local.d/history_redis.conf', $replacements, true);
 		}
 
 		if(ISPConfig::wantsUnbound()) {