diff --git a/Utility/Quvi.hs b/Utility/Quvi.hs
index 4dc15fe927..0412116a17 100644
--- a/Utility/Quvi.hs
+++ b/Utility/Quvi.hs
@@ -6,6 +6,7 @@
  -}
 
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE FlexibleContexts #-}
 
 module Utility.Quvi where
 
diff --git a/Utility/Url.hs b/Utility/Url.hs
index 9537e86b78..2ef1167e56 100644
--- a/Utility/Url.hs
+++ b/Utility/Url.hs
@@ -8,6 +8,7 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE FlexibleContexts #-}
 
 module Utility.Url (
 	URLString,