diff --git a/lang/en/cache.php b/lang/en/cache.php
index e2ee36b923b56..208e9a455d923 100644
--- a/lang/en/cache.php
+++ b/lang/en/cache.php
@@ -34,6 +34,7 @@
 $string['caching'] = 'Caching';
 $string['cacheadmin'] = 'Cache administration';
 $string['cacheconfig'] = 'Configuration';
+$string['cachedef_calendar_subscriptions'] = 'Calendar subscriptions';
 $string['cachedef_config'] = 'Config settings';
 $string['cachedef_databasemeta'] = 'Database meta information';
 $string['cachedef_eventinvalidation'] = 'Event invalidation';