1 files changed, 7 insertions, 2 deletions
diff --git a/compiler/hsSyn/HsSyn.hs b/compiler/hsSyn/HsSyn.hs
index 1534491a47..b9abcf2683 100644
--- a/compiler/hsSyn/HsSyn.hs
+++ b/compiler/hsSyn/HsSyn.hs
@@ -16,6 +16,7 @@ therefore, is almost nothing but re-exporting.
                                       -- in module PlaceHolder
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE FlexibleInstances #-} -- For deriving instance Data
 
 module HsSyn (
         module HsBinds,
@@ -31,7 +32,7 @@ module HsSyn (
         module HsExtension,
         Fixity,
 
-        HsModule(..)
+        HsModule(..),
 ) where
 
 -- friends:
@@ -49,6 +50,7 @@ import HsTypes
 import BasicTypes       ( Fixity, WarningTxt )
 import HsUtils
 import HsDoc
+import HsInstances ()
 
 -- others:
 import Outputable
@@ -111,7 +113,10 @@ data HsModule name
      --    hsmodImports,hsmodDecls if this style is used.
 
      -- For details on above see note [Api annotations] in ApiAnnotation
-deriving instance (DataIdLR name name) => Data (HsModule name)
+-- deriving instance (DataIdLR name name) => Data (HsModule name)
+deriving instance Data (HsModule GhcPs)
+deriving instance Data (HsModule GhcRn)
+deriving instance Data (HsModule GhcTc)
 
 instance (p ~ GhcPass pass, OutputableBndrId p) => Outputable (HsModule p) where