diff --git a/pkgs/development/libraries/haskell/encoding/default.nix b/pkgs/development/libraries/haskell/encoding/default.nix
index 5ec0f1502c3..148d4f4debf 100644
--- a/pkgs/development/libraries/haskell/encoding/default.nix
+++ b/pkgs/development/libraries/haskell/encoding/default.nix
@@ -9,6 +9,7 @@ cabal.mkDerivation (self: {
   buildDepends = [
     binary extensibleExceptions HaXml mtl regexCompat
   ];
+  jailbreak = true;
   meta = {
     homepage = "http://code.haskell.org/encoding/";
     description = "A library for various character encodings";