diff --git a/pkgs/applications/networking/cluster/panamax/api/default.nix b/pkgs/applications/networking/cluster/panamax/api/default.nix
index 2b801ec1acf..3347af83585 100644
--- a/pkgs/applications/networking/cluster/panamax/api/default.nix
+++ b/pkgs/applications/networking/cluster/panamax/api/default.nix
@@ -11,9 +11,7 @@ stdenv.mkDerivation rec {
   env = bundlerEnv {
     name = "panamax-api-gems-${version}";
     inherit ruby;
-    gemset = ./gemset.nix;
-    gemfile = ./Gemfile;
-    lockfile = ./Gemfile.lock;
+    gemdir = ./.;
   };
 
   bundler = args.bundler.override { inherit ruby; };