diff --git a/roles/archwiki/templates/LocalSettings.php.j2 b/roles/archwiki/templates/LocalSettings.php.j2
index fbb3ee11460b49bceef14e8652ab68edb54a3fb4..bd3edbdff37e77c5ba5a34409c69ccca6e1b9cca 100644
--- a/roles/archwiki/templates/LocalSettings.php.j2
+++ b/roles/archwiki/templates/LocalSettings.php.j2
@@ -398,6 +398,8 @@ wfLoadExtension( 'Interwiki' );
 $wgGroupPermissions['sysop']['interwiki'] = true;
 
 # TitleKey extension
+# Suppress deprecation warning, see https://phabricator.wikimedia.org/T353985
+$wgDeprecationReleaseLimit = "1.0";
 wfLoadExtension( 'TitleKey' );
 
 # BounceHandler extension