diff --git a/pkgs/development/python-modules/asynctest/default.nix b/pkgs/development/python-modules/asynctest/default.nix
index d36328d7225b1..dda3d35f6adda 100644
--- a/pkgs/development/python-modules/asynctest/default.nix
+++ b/pkgs/development/python-modules/asynctest/default.nix
@@ -18,7 +18,7 @@ buildPythonPackage rec {
   '';
 
   # https://github.com/Martiusweb/asynctest/issues/132
-  doCheck = pythonOlder "3.8";
+  doCheck = pythonOlder "3.7";
 
   checkPhase = ''
     ${python.interpreter} -m unittest test