diff --git a/pkgs/development/libraries/haskell/yst/default.nix b/pkgs/development/libraries/haskell/yst/default.nix
index 9597861c6fe..284ae8af8cd 100644
--- a/pkgs/development/libraries/haskell/yst/default.nix
+++ b/pkgs/development/libraries/haskell/yst/default.nix
@@ -15,6 +15,7 @@ cabal.mkDerivation (self: {
     aeson csv filepath HDBC HDBCSqlite3 HStringTemplate pandoc parsec
     scientific split text time unorderedContainers xhtml yaml
   ];
+  jailbreak = true;
   meta = {
     homepage = "http://github.com/jgm/yst";
     description = "Builds a static website from templates and data in YAML or CSV files";