diff --git a/Assistant/WebApp/Notifications.hs b/Assistant/WebApp/Notifications.hs
index f5b2d7ccdb..edbbd66576 100644
--- a/Assistant/WebApp/Notifications.hs
+++ b/Assistant/WebApp/Notifications.hs
@@ -5,7 +5,7 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
-{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}
+{-# LANGUAGE CPP, TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}
 
 module Assistant.WebApp.Notifications where