diff --git a/pkgs/development/python-modules/channels/default.nix b/pkgs/development/python-modules/channels/default.nix
index 5bc2db228ae4..2d6f0d009169 100644
--- a/pkgs/development/python-modules/channels/default.nix
+++ b/pkgs/development/python-modules/channels/default.nix
@@ -41,10 +41,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ] ++ passthru.optional-dependencies.daphne;
 
-  pytestFlagsArray = [
-    "--asyncio-mode=legacy"
-  ];
-
   pythonImportsCheck = [
     "channels"
   ];