diff --git a/pkgs/development/libraries/haskell/yesod-core/default.nix b/pkgs/development/libraries/haskell/yesod-core/default.nix
index c0bef5018ba..87723df26c3 100644
--- a/pkgs/development/libraries/haskell/yesod-core/default.nix
+++ b/pkgs/development/libraries/haskell/yesod-core/default.nix
@@ -9,8 +9,8 @@
 
 cabal.mkDerivation (self: {
   pname = "yesod-core";
-  version = "1.1.2";
-  sha256 = "1pgwqghj9kc9kh90515nswz5ssbmm2y6miw5j6sx4dha0xncqvgs";
+  version = "1.1.2.1";
+  sha256 = "195r19xsd3fvsirz62mkfxqgw5zi4lx700ly08h1i0kvmfnfx1g8";
   buildDepends = [
     aeson blazeBuilder blazeHtml blazeMarkup caseInsensitive cereal
     clientsession conduit cookie failure fastLogger hamlet httpTypes
@@ -19,6 +19,7 @@ cabal.mkDerivation (self: {
     text time transformers transformersBase vector wai waiExtra
     yesodRoutes
   ];
+  jailbreak = true;
   meta = {
     homepage = "http://www.yesodweb.com/";
     description = "Creation of type-safe, RESTful web applications";