1 files changed, 3 insertions, 3 deletions
diff --git a/haddock-api/src/Haddock/Interface/AttachInstances.hs b/haddock-api/src/Haddock/Interface/AttachInstances.hs
index 2231ce7e..0e5811b1 100644
--- a/haddock-api/src/Haddock/Interface/AttachInstances.hs
+++ b/haddock-api/src/Haddock/Interface/AttachInstances.hs
@@ -118,12 +118,12 @@ attachToExportItem index expInfo iface ifaceMap instIfaceMap export =
   where
     attachFixities e@ExportDecl{ expItemDecl = L _ d
                                , expItemPats = patsyns
-                               , expItemSubDocs = subDocs
                                } = e { expItemFixities =
       nubByName fst $ expItemFixities e ++
       [ (n',f) | n <- getMainDeclBinder d
-               , n' <- n : (map fst subDocs ++ patsyn_names)
-               , Just f <- [instLookup instFixMap n' iface ifaceMap instIfaceMap]
+              , Just subs <- [instLookup instSubMap n iface ifaceMap instIfaceMap <|> Just []]
+              , n' <- n : (subs ++ patsyn_names)
+              , Just f <- [instLookup instFixMap n' iface ifaceMap instIfaceMap]
       ] }
       where
         patsyn_names = concatMap (getMainDeclBinder . fst) patsyns