diff --git a/pkgs/development/python-modules/debtcollector/tests.nix b/pkgs/development/python-modules/debtcollector/tests.nix
index 5c10dc90904d..19386cdb53b8 100644
--- a/pkgs/development/python-modules/debtcollector/tests.nix
+++ b/pkgs/development/python-modules/debtcollector/tests.nix
@@ -3,11 +3,10 @@
 , stestr
 }:
 
-buildPythonPackage rec {
+buildPythonPackage {
   pname = "debtcollector-tests";
-  inherit (debtcollector) version;
-
-  src = debtcollector.src;
+  inherit (debtcollector) version src;
+  format = "other";
 
   postPatch = ''
     # only a small portion of the listed packages are actually needed for running the tests