diff --git a/utils/genprimopcode/ParserM.hs b/utils/genprimopcode/ParserM.hs
index 4dedfa39dd2afa5bb27e1a9327b27cbf7af94e6c..190ec0edc078c49a52fa31b73d26fc41d277ca8e 100644
--- a/utils/genprimopcode/ParserM.hs
+++ b/utils/genprimopcode/ParserM.hs
@@ -16,7 +16,10 @@ module ParserM (
     -- Other
     happyError
  ) where
+
 import Control.Applicative
+import Prelude
+
 import Control.Monad (ap, liftM)
 import Data.Word (Word8)
 import Data.Char (ord)