diff --git a/pkgs/development/python-modules/setuptools-rust/default.nix b/pkgs/development/python-modules/setuptools-rust/default.nix
index 8f340085ca07..a13c0e7be526 100644
--- a/pkgs/development/python-modules/setuptools-rust/default.nix
+++ b/pkgs/development/python-modules/setuptools-rust/default.nix
@@ -59,7 +59,6 @@ buildPythonPackage rec {
 
   passthru.tests = {
     pyo3 = maturin.tests.pyo3.override {
-      format = "setuptools";
       buildAndTestSubdir = null;
 
       nativeBuildInputs = [