diff --git a/compiler/GHC/Cmm/Parser.y b/compiler/GHC/Cmm/Parser.y
index 0be73b66f8e5d97ef0e1d55bdbee8756c6529da2..b2c107d429152b84f199ebd91b3abbf8b9c77be3 100644
--- a/compiler/GHC/Cmm/Parser.y
+++ b/compiler/GHC/Cmm/Parser.y
@@ -203,6 +203,7 @@ necessary to the stack to accommodate it (e.g. 2).
 module GHC.Cmm.Parser ( parseCmmFile ) where
 
 import GHC.Prelude
+import qualified Prelude -- for happy-generated code
 
 import GHC.Platform
 import GHC.Platform.Profile
diff --git a/compiler/GHC/Parser.y b/compiler/GHC/Parser.y
index 185dc362eab804a917cab9ce9f3de3c13d91ee80..0cd8f29cac552eef56dff152a56d2701a88198ea 100644
--- a/compiler/GHC/Parser.y
+++ b/compiler/GHC/Parser.y
@@ -46,7 +46,7 @@ import Data.Char
 import Data.Maybe       ( maybeToList )
 import Control.Monad    ( mplus )
 import Control.Applicative ((<$))
-import qualified Prelude
+import qualified Prelude -- for happy-generated code
 
 -- compiler
 import GHC.Hs