diff --git a/.gitlab/script/ghcup_release.sh b/.gitlab/script/ghcup_release.sh
index 63235d9..b50f3cf 100755
--- a/.gitlab/script/ghcup_release.sh
+++ b/.gitlab/script/ghcup_release.sh
@@ -14,11 +14,11 @@ ecabal() {
 ecabal update
 
 if [ "${OS}" = "LINUX" ] ; then
-	ecabal build -w ghc-${GHC_VERSION} -fcurl --ghc-options='-split-sections -optl-static'
+	ecabal build -w ghc-${GHC_VERSION} --ghc-options='-split-sections -optl-static'
 elif [ "${OS}" = "FREEBSD" ] ; then
-	ecabal build -w ghc-${GHC_VERSION} -fcurl --ghc-options='-split-sections'
+	ecabal build -w ghc-${GHC_VERSION} --ghc-options='-split-sections'
 else
-	ecabal build -w ghc-${GHC_VERSION} -fcurl
+	ecabal build -w ghc-${GHC_VERSION}
 fi
 
 mkdir out
diff --git a/.gitlab/script/ghcup_version.sh b/.gitlab/script/ghcup_version.sh
index 07d8648..c342cf7 100755
--- a/.gitlab/script/ghcup_version.sh
+++ b/.gitlab/script/ghcup_version.sh
@@ -20,9 +20,9 @@ eghcup() {
 ecabal update
 
 if [ "${OS}" = "DARWIN" ] ; then
-	ecabal build -w ghc-${GHC_VERSION} -fcurl
-else
 	ecabal build -w ghc-${GHC_VERSION}
+else
+	ecabal build -w ghc-${GHC_VERSION} -finternal-downloader
 fi
 
 cp "$(ecabal new-exec --enable-tests --verbose=0 --offline sh -- -c 'command -v ghcup')" .
diff --git a/ghcup.cabal b/ghcup.cabal
index e616f6e..bceecf1 100644
--- a/ghcup.cabal
+++ b/ghcup.cabal
@@ -21,8 +21,8 @@ source-repository head
   type:     git
   location: https://gitlab.haskell.org/haskell/ghcup-hs.git
 
-flag Curl
-  description: Use curl instead of http-io-streams for download
+flag internal-downloader
+  description: Compile the internal downloader, which links against OpenSSL
   default:     False
   manual:      True
 
@@ -304,15 +304,14 @@ library
   -- other-extensions:
   hs-source-dirs:  lib
 
-  if !flag(curl)
+  if flag(internal-downloader)
     import:
       , HsOpenSSL
       , http-io-streams
       , io-streams
       , terminal-progress-bar
     exposed-modules: GHCup.Download.IOStreams
-  else
-    cpp-options:     -DCURL
+    cpp-options:     -DINTERNAL_DOWNLOADER
 
 executable ghcup
   import:
diff --git a/lib/GHCup/Download.hs b/lib/GHCup/Download.hs
index a79c5be..93b2ccf 100644
--- a/lib/GHCup/Download.hs
+++ b/lib/GHCup/Download.hs
@@ -11,7 +11,7 @@
 
 module GHCup.Download where
 
-#if !defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
 import           GHCup.Download.IOStreams
 import           GHCup.Download.Utils
 #endif
@@ -35,7 +35,7 @@ import           Control.Monad.Reader
 import           Control.Monad.Trans.Resource
                                          hiding ( throwM )
 import           Data.Aeson
-#if !defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
 import           Data.ByteString                ( ByteString )
 import           Data.CaseInsensitive           ( CI )
 #endif
@@ -43,7 +43,7 @@ import           Data.Maybe
 import           Data.String.Interpolate
 import           Data.Time.Clock
 import           Data.Time.Clock.POSIX
-#if !defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
 import           Data.Time.Format
 #endif
 import           Data.Versions
@@ -62,7 +62,7 @@ import           URI.ByteString
 import qualified Crypto.Hash.SHA256            as SHA256
 import qualified Data.ByteString.Base16        as B16
 import qualified Data.ByteString.Lazy          as L
-#if !defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
 import qualified Data.CaseInsensitive          as CI
 import qualified Data.Map.Strict               as M
 import qualified Data.Text                     as T
@@ -220,7 +220,7 @@ getDownloads urlSource = do
 
 
     getModTime = do
-#if defined(CURL)
+#if !defined(INTERNAL_DOWNLOADER)
       pure Nothing
 #else
       headers <-
@@ -319,7 +319,7 @@ download dli dest mfn
             (liftIO $ hideError doesNotExistErrorType $ deleteFile destFile)
               >> (throwE . DownloadFailed $ e)
           ) $ do
-#if defined(CURL)
+#if !defined(INTERNAL_DOWNLOADER)
               liftE $ lEM @_ @'[ProcessError] $ liftIO $ exec "curl" True
                 ["-fL", "-o", toFilePath destFile , serializeURIRef' $ view dlUri dli] Nothing Nothing
 #else
@@ -404,7 +404,7 @@ downloadBS uri'
  where
   scheme = view (uriSchemeL' % schemeBSL') uri'
   path   = view pathL' uri'
-#if defined(CURL)
+#if !defined(INTERNAL_DOWNLOADER)
   dl _ = do
     lift $ $(logDebug) [i|downloading: #{serializeURIRef' uri'}|]
     let exe = [rel|curl|]