diff --git a/pkgs/development/python-modules/subarulink/default.nix b/pkgs/development/python-modules/subarulink/default.nix
index d788e164f80d..bf975f5e8483 100644
--- a/pkgs/development/python-modules/subarulink/default.nix
+++ b/pkgs/development/python-modules/subarulink/default.nix
@@ -36,10 +36,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  pytestFlagsArray = [
-    "--asyncio-mode=legacy"
-  ];
-
   postPatch = ''
     substituteInPlace setup.cfg \
       --replace "--cov=subarulink" ""