diff --git a/panel/nix/python-packages/default.nix b/panel/nix/python-packages/default.nix
index 91b2dab5..bec1900d 100644
--- a/panel/nix/python-packages/default.nix
+++ b/panel/nix/python-packages/default.nix
@@ -28,12 +28,11 @@ let
     (
       {
         django-pydantic-field =
-          pkgs.callPackage
+          callPackage
             "${sources.nixpkgs-unstable}/pkgs/development/python-modules/django-pydantic-field/default.nix"
             { };
         drf-pydantic =
-          pkgs.callPackage
-            "${sources.nixpkgs-unstable}/pkgs/development/python-modules/drf-pydantic/default.nix"
+          callPackage "${sources.nixpkgs-unstable}/pkgs/development/python-modules/drf-pydantic/default.nix"
             { };
       }
       # will read further packages from sub-dirs here