diff --git a/mozilla/calendar/locales/all-locales b/mozilla/calendar/locales/all-locales
index 864db4f9316..f8a1f4b7785 100644
--- a/mozilla/calendar/locales/all-locales
+++ b/mozilla/calendar/locales/all-locales
@@ -8,6 +8,7 @@ eu
 fr
 ga-IE
 hu
+is
 it
 ja
 ja-JP-mac