diff --git a/haddock-api/src/Haddock/Convert.hs b/haddock-api/src/Haddock/Convert.hs
index 436504a823b565d9e136838e3855c36882246800..bcb30a122d67307e18d60c9bf9046b78beb84a3a 100644
--- a/haddock-api/src/Haddock/Convert.hs
+++ b/haddock-api/src/Haddock/Convert.hs
@@ -1,7 +1,8 @@
-{-# LANGUAGE CPP           #-}
-{-# LANGUAGE PatternGuards #-}
-{-# LANGUAGE TypeFamilies  #-}
-{-# LANGUAGE BangPatterns  #-}
+{-# LANGUAGE CPP              #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE PatternGuards    #-}
+{-# LANGUAGE TypeFamilies     #-}
+{-# LANGUAGE BangPatterns     #-}
 
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