diff --git a/app/ghcup/GHCup/OptParse/Compile.hs b/app/ghcup/GHCup/OptParse/Compile.hs
index bec9ec7..f50fb9d 100644
--- a/app/ghcup/GHCup/OptParse/Compile.hs
+++ b/app/ghcup/GHCup/OptParse/Compile.hs
@@ -77,7 +77,6 @@ data GHCCompileOptions = GHCCompileOptions
   , ovewrwiteVer :: Maybe Version
   , buildFlavour :: Maybe String
   , hadrian      :: Bool
-  , bignum       :: Maybe String
   , isolateDir   :: Maybe FilePath
   }
 
@@ -272,13 +271,6 @@ ghcCompileOpts =
     <*> switch
           (long "hadrian" <> help "Use the hadrian build system instead of make (only git versions seem to be properly supported atm)"
           )
-    <*> optional
-          (option
-            str
-            (long "bignum" <> metavar "INTEGER_BACKEND" <> help
-              "Set the integer backend. This value differs between make ('integer-gmp' and 'integer-simple') and hadrian ('gmp' and 'native')"
-            )
-          )
     <*> optional
           (option
             (eitherReader isolateParser)
@@ -585,7 +577,6 @@ compile compileCommand settings Dirs{..} runAppState runLogger = do
                     patches
                     addConfArgs
                     buildFlavour
-                    bignum
                     hadrian
                     (maybe GHCupInternal IsolateDir isolateDir)
         GHCupInfo { _ghcupDownloads = dls } <- lift getGHCupInfo
diff --git a/lib/GHCup/GHC.hs b/lib/GHCup/GHC.hs
index f0e1aa8..df59031 100644
--- a/lib/GHCup/GHC.hs
+++ b/lib/GHCup/GHC.hs
@@ -764,7 +764,6 @@ compileGHC :: ( MonadMask m
            -> Maybe (Either FilePath [URI])  -- ^ patches
            -> [Text]                   -- ^ additional args to ./configure
            -> Maybe String             -- ^ build flavour
-           -> Maybe String             -- ^ bignum
            -> Bool
            -> InstallDir
            -> Excepts
@@ -794,7 +793,7 @@ compileGHC :: ( MonadMask m
                  ]
                 m
                 GHCTargetVersion
-compileGHC targetGhc crossTarget ov bstrap jobs mbuildConfig patches aargs buildFlavour bignum hadrian installDir
+compileGHC targetGhc crossTarget ov bstrap jobs mbuildConfig patches aargs buildFlavour hadrian installDir
   = do
     PlatformRequest { .. } <- lift getPlatformReq
     GHCupInfo { _ghcupDownloads = dls } <- lift getGHCupInfo
@@ -1024,7 +1023,6 @@ compileGHC targetGhc crossTarget ov bstrap jobs mbuildConfig patches aargs build
     lEM $ execWithGhcEnv hadrian_build
                           ( maybe [] (\j  -> ["-j" <> show j]         ) jobs
                          ++ maybe [] (\bf -> ["--flavour=" <> bf]) buildFlavour
-                         ++ maybe [] (\bn -> ["--bignum=" <> bn]) bignum
                          ++ ["binary-dist"]
                           )
                           (Just workdir) "ghc-make"
@@ -1083,7 +1081,7 @@ compileGHC targetGhc crossTarget ov bstrap jobs mbuildConfig patches aargs build
         (FileDoesNotExistError bc)
         (liftIO $ copyFile bc (build_mk workdir) False)
       Nothing ->
-        liftIO $ T.writeFile (build_mk workdir) (addBigNumToConf $ addBuildFlavourToConf defaultConf)
+        liftIO $ T.writeFile (build_mk workdir) (addBuildFlavourToConf defaultConf)
 
     liftE $ checkBuildConfig (build_mk workdir)
 
@@ -1181,10 +1179,6 @@ compileGHC targetGhc crossTarget ov bstrap jobs mbuildConfig patches aargs build
     Just bf -> "BuildFlavour = " <> T.pack bf <> "\n" <> bc
     Nothing -> bc
 
-  addBigNumToConf bc = case bignum of
-    Just bn -> bc <> "\nINTEGER_LIBRARY = " <> T.pack bn
-    Nothing -> bc
-
   isCross :: GHCTargetVersion -> Bool
   isCross = isJust . _tvTarget