diff --git a/pkgs/development/libraries/haskell/heist/default.nix b/pkgs/development/libraries/haskell/heist/default.nix
index 77ebf3fd9af1..faf5212a7942 100644
--- a/pkgs/development/libraries/haskell/heist/default.nix
+++ b/pkgs/development/libraries/haskell/heist/default.nix
@@ -13,6 +13,7 @@ cabal.mkDerivation (self: {
     filepath hashable MonadCatchIOTransformers mtl random text time
     transformers unorderedContainers vector xmlhtml
   ];
+  jailbreak = true;
   meta = {
     homepage = "http://snapframework.com/";
     description = "An Haskell template system supporting both HTML5 and XML";