diff --git a/src/Streamly/Internal/Data/Unbox/TH.hs b/src/Streamly/Internal/Data/Unbox/TH.hs
index 3b17618b29..c5605c52b5 100644
--- a/src/Streamly/Internal/Data/Unbox/TH.hs
+++ b/src/Streamly/Internal/Data/Unbox/TH.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE TemplateHaskell #-}
+{-# OPTIONS_GHC -Wno-implicit-lift #-}
 
 module Streamly.Internal.Data.Unbox.TH
     ( makeUnbox
@@ -10,8 +11,6 @@ module Streamly.Internal.Data.Unbox.TH
 -- Imports
 --------------------------------------------------------------------------------
 
-import Data.Maybe (fromMaybe)
-import Data.List (find)
 import Data.Word (Word16, Word32, Word64, Word8)
 import Data.Proxy (Proxy(..))
 import TH.Utilities (appsT, plainInstanceD)
@@ -204,10 +203,10 @@ mkPokeExprFields tagSize fields = do
               $(varE (mkFieldName i))|]
 
 mkPokeMatch :: Name -> Int -> Q Exp -> Q Match
-mkPokeMatch cname numFields exp =
+mkPokeMatch cname numFields exp0 =
     match
         (conP cname (map varP (map mkFieldName [0 .. (numFields - 1)])))
-        (normalB exp)
+        (normalB exp0)
         []
 
 mkPokeExpr :: Type -> [DataCon] -> Q Exp
@@ -217,14 +216,14 @@ mkPokeExpr headTy cons =
             [|error
                   ("Attempting to poke type with no constructors (" ++
                    $(lift (pprint headTy)) ++ ")")|]
-        [con@(DataCon cname _ _ fields)] ->
+        [(DataCon cname _ _ fields)] ->
             caseE
                 (varE _val)
                 [mkPokeMatch cname (length fields) (mkPokeExprFields 0 fields)]
         _ ->
             caseE
                 (varE _val)
-                (map (\(tagVal, con@(DataCon cname _ _ fields)) ->
+                (map (\(tagVal, (DataCon cname _ _ fields)) ->
                           mkPokeMatch
                               cname
                               (length fields)