diff --git a/pkgs/development/libraries/haskell/rfc5051/default.nix b/pkgs/development/libraries/haskell/rfc5051/default.nix
index 8b5fc2e142bc..19c3d2eeac90 100644
--- a/pkgs/development/libraries/haskell/rfc5051/default.nix
+++ b/pkgs/development/libraries/haskell/rfc5051/default.nix
@@ -1,4 +1,4 @@
-{ cabal }:
+{ cabal, glibcLocales }:
 
 cabal.mkDerivation (self: {
   pname = "rfc5051";
@@ -6,6 +6,8 @@ cabal.mkDerivation (self: {
   sha256 = "0j009h78gw92bl61g0js6xkah76lb6gm0lv55z2sw6gxm4a1ygml";
   isLibrary = true;
   isExecutable = true;
+  preConfigure = "export LANG=en_US.UTF-8"
+               + self.stdenv.lib.optionalString self.stdenv.isLinux " LOCALE_ARCHIVE=${glibcLocales}/lib/locale/locale-archive";
   meta = {
     description = "Simple unicode collation as per RFC5051";
     license = self.stdenv.lib.licenses.bsd3;