diff --git a/pkgs/development/libraries/haskell/clay/default.nix b/pkgs/development/libraries/haskell/clay/default.nix
index 8eafd67cadb..11b141d74ca 100644
--- a/pkgs/development/libraries/haskell/clay/default.nix
+++ b/pkgs/development/libraries/haskell/clay/default.nix
@@ -8,6 +8,7 @@ cabal.mkDerivation (self: {
   sha256 = "1w2617kpj6rblmycqb97gyshwbvzp5w2h4xh494mvdzi3bkahqpn";
   buildDepends = [ mtl text ];
   testDepends = [ HUnit mtl testFramework testFrameworkHunit text ];
+  jailbreak = true;
   meta = {
     homepage = "http://fvisser.nl/clay";
     description = "CSS preprocessor as embedded Haskell";