diff --git a/pkgs/development/python-modules/xbox-webapi/default.nix b/pkgs/development/python-modules/xbox-webapi/default.nix
index b16a87e2fd64..ccd2d3febf13 100644
--- a/pkgs/development/python-modules/xbox-webapi/default.nix
+++ b/pkgs/development/python-modules/xbox-webapi/default.nix
@@ -44,6 +44,10 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  pytestFlagsArray = [
+    "--asyncio-mode=legacy"
+  ];
+
   meta = with lib; {
     description = "Library to authenticate with Windows Live/Xbox Live and use their API";
     homepage = "https://github.com/OpenXbox/xbox-webapi-python";