diff --git a/pkgs/applications/misc/taskjuggler/3.x/default.nix b/pkgs/applications/misc/taskjuggler/3.x/default.nix
index eaca537356b..23252d0c480 100644
--- a/pkgs/applications/misc/taskjuggler/3.x/default.nix
+++ b/pkgs/applications/misc/taskjuggler/3.x/default.nix
@@ -4,9 +4,7 @@ bundlerEnv {
   name = "taskjuggler-3.5.0";
 
   inherit ruby;
-  gemfile = ./Gemfile;
-  lockfile = ./Gemfile.lock;
-  gemset = ./gemset.nix;
+  gemdir = ./.;
 
   meta = {
     description = "A modern and powerful project management tool";