diff --git a/lib/default.nix b/lib/default.nix
index e888b532..efb66414 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -56,6 +56,7 @@ rec {
       {-# LANGUAGE OverloadedStrings #-}
       {-# LANGUAGE ExtendedDefaultRules #-}
       {-# LANGUAGE MultiWayIf #-}
+      {-# LANGUAGE LambdaCase #-}
 
       import Shh
       import qualified Prelude