diff --git a/mozilla/build/mac/build_scripts/MozillaCheckoutList.txt b/mozilla/build/mac/build_scripts/MozillaCheckoutList.txt
index 5ced73f9cb8..b73f3a581d8 100644
--- a/mozilla/build/mac/build_scripts/MozillaCheckoutList.txt
+++ b/mozilla/build/mac/build_scripts/MozillaCheckoutList.txt
@@ -19,5 +19,5 @@ SeaMonkeyAll
 ## Note that this library is under the LGPL, not the MPL
 #mozilla/other-licenses/libart_lgpl
 ## You need the following two if you want to use calendar.
-#mozilla/calendar
-#mozilla/other-licenses/libical
+mozilla/calendar
+mozilla/other-licenses/libical