diff --git a/Utility/Terminal.hs b/Utility/Terminal.hs
index bd96699e95..621fa6047a 100644
--- a/Utility/Terminal.hs
+++ b/Utility/Terminal.hs
@@ -5,7 +5,7 @@
  - License: BSD-2-clause
  -}
 
-{-# LANGUAGE CPP #-}
+{-# LANGUAGE CPP, ScopedTypeVariables #-}
 {-# OPTIONS_GHC -fno-warn-tabs #-}
 
 module Utility.Terminal (