diff --git a/pkgs/development/interpreters/python/mk-python-derivation.nix b/pkgs/development/interpreters/python/mk-python-derivation.nix
index 04deb32b6a3a..4092c64ba713 100644
--- a/pkgs/development/interpreters/python/mk-python-derivation.nix
+++ b/pkgs/development/interpreters/python/mk-python-derivation.nix
@@ -417,8 +417,6 @@ let
           dependencies
           optional-dependencies
           ;
-      }
-      // {
         updateScript = nix-update-script { };
       }
       // attrs.passthru or { };