1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/python-modules/rfc3339-validator/default.nix b/pkgs/development/python-modules/rfc3339-validator/default.nix
index e1a9f03188820..9de6919692a4e 100644
--- a/pkgs/development/python-modules/rfc3339-validator/default.nix
+++ b/pkgs/development/python-modules/rfc3339-validator/default.nix
@@ -10,6 +10,7 @@
 buildPythonPackage rec {
   pname = "rfc3339-validator";
   version = "0.1.4";
+  format = "setuptools";
 
   src = fetchPypi {
     pname = "rfc3339_validator";