diff --git a/pkgs/development/libraries/haskell/yesod-bin/default.nix b/pkgs/development/libraries/haskell/yesod-bin/default.nix
index d722d5cd608..3bca09f4fb6 100644
--- a/pkgs/development/libraries/haskell/yesod-bin/default.nix
+++ b/pkgs/development/libraries/haskell/yesod-bin/default.nix
@@ -10,8 +10,8 @@
 
 cabal.mkDerivation (self: {
   pname = "yesod-bin";
-  version = "1.2.9.3";
-  sha256 = "1gjcg798d7xpd8hgz8s1napgxm9dnbsks1g1s5hgx8ml5xkp2la7";
+  version = "1.2.9.4";
+  sha256 = "0ir77hmg3avkm4x7pgmjx3fijisncpwklg4v1glqx4vqbjjrzk5g";
   isLibrary = false;
   isExecutable = true;
   buildDepends = [
@@ -23,18 +23,6 @@ cabal.mkDerivation (self: {
     systemFileio systemFilepath tar text time transformers unixCompat
     unorderedContainers wai waiExtra warp yaml zlib
   ];
-
-  postInstall = ''
-    mv $out/bin/yesod $out/bin/.yesod-wrapped
-    cat - > $out/bin/yesod <<EOF
-    #! ${self.stdenv.shell}
-    export HSENV=1
-    export PACKAGE_DB_FOR_GHC='$( ${self.ghc.GHCGetPackages} ${self.ghc.version} | tr " " "\n" | tail -n +2 | paste -d " " - - | sed 's/.*/-g "&"/' | tr "\n" " ")'
-    eval exec $out/bin/.yesod-wrapped "\$@"
-    EOF
-    chmod +x $out/bin/yesod
-  '';
-
   meta = {
     homepage = "http://www.yesodweb.com/";
     description = "The yesod helper executable";