diff --git a/pkgs/development/haskell-modules/make-package-set.nix b/pkgs/development/haskell-modules/make-package-set.nix
index cd9a101d3c5d..ba477e06e2f1 100644
--- a/pkgs/development/haskell-modules/make-package-set.nix
+++ b/pkgs/development/haskell-modules/make-package-set.nix
@@ -133,7 +133,7 @@ let
       installPhase = ''
         export HOME="$TMP"
         mkdir -p "$out"
-        cabal2nix --compiler=${self.ghc.haskellCompilerName} --system=${hostPlatform.system} ${sha256Arg} "${src}" ${extraCabal2nixOptions} > "$out/default.nix"
+        cabal2nix --compiler=${self.ghc.haskellCompilerName} --system=${hostPlatform.config} ${sha256Arg} "${src}" ${extraCabal2nixOptions} > "$out/default.nix"
       '';
   };