diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 14afa3dfe6b44e..079698ebd13fa3 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -802,7 +802,7 @@ stdenv.mkDerivation ({
         buildInputs =
           otherBuildInputsSystem;
         LANG = "en_US.UTF-8";
-        LOCALE_ARCHIVE = lib.optionalString (stdenv.hostPlatform.libc == "glibc") "${buildPackages.glibcLocales}/lib/locale/locale-archive";
+        LOCALE_ARCHIVE = lib.optionalString (stdenv.hostPlatform.libc == "glibc" && buildPackages.glibcLocales != null) "${buildPackages.glibcLocales}/lib/locale/locale-archive";
         "NIX_${ghcCommandCaps}" = "${ghcEnv}/bin/${ghcCommand}";
         "NIX_${ghcCommandCaps}PKG" = "${ghcEnv}/bin/${ghcCommand}-pkg";
         # TODO: is this still valid?