diff --git a/release.nix b/release.nix
index f9f3afb..e32214c 100644
--- a/release.nix
+++ b/release.nix
@@ -1,8 +1,20 @@
 let
   pkgs       = import <nixpkgs> { };
   pipes-zlib = pkgs.haskell.lib.doJailbreak pkgs.haskellPackages.pipes-zlib;
-  produce    = path: args: pkgs.haskell.lib.dontCheck
-      (pkgs.haskellPackages.callCabal2nix (builtins.baseNameOf path) path args);
+  produce    = path: args: testPatch
+    (pkgs.haskellPackages.callCabal2nix (builtins.baseNameOf path) path args);
+  gitRepo = ./.git;
+  testPatch = prj: pkgs.haskell.lib.overrideCabal prj (_prj: {
+    postPatch = ''
+      tmpGit="$(${pkgs.coreutils}/bin/mktemp -d)"
+      echo $tmpGit
+      cp -r ${gitRepo} $tmpGit
+      ls -al $tmpGit
+      substituteInPlace $src/test/Spec.hs --replace \
+        'repo = "../.git"'
+        "repo = \"$tmpGit\""
+    '';
+  });
 
 in rec {
   duffer           = produce ./duffer           {};