diff --git a/pkgs/development/libraries/haskell/heist/default.nix b/pkgs/development/libraries/haskell/heist/default.nix
index 6a6d0d7ddf3b..4191536407e1 100644
--- a/pkgs/development/libraries/haskell/heist/default.nix
+++ b/pkgs/development/libraries/haskell/heist/default.nix
@@ -12,6 +12,7 @@ cabal.mkDerivation (self: {
     filepath hashable MonadCatchIOTransformers mtl random text time
     unorderedContainers vector xmlhtml
   ];
+  jailbreak = true;
   meta = {
     homepage = "http://snapframework.com/";
     description = "An Haskell template system supporting both HTML5 and XML";