diff --git a/pkgs/development/python-modules/pybalboa/default.nix b/pkgs/development/python-modules/pybalboa/default.nix
index e00186809690..5ad085c44975 100644
--- a/pkgs/development/python-modules/pybalboa/default.nix
+++ b/pkgs/development/python-modules/pybalboa/default.nix
@@ -4,7 +4,7 @@
   fetchFromGitHub,
   poetry-core,
   poetry-dynamic-versioning,
-  pytest-asyncio,
+  pytest-asyncio_0,
   pytestCheckHook,
 }:
 
@@ -27,10 +27,15 @@ buildPythonPackage rec {
   ];
 
   nativeCheckInputs = [
-    pytest-asyncio
+    pytest-asyncio_0
     pytestCheckHook
   ];
 
+  disabledTests = [
+    # async def functions are not natively supported.
+    "test_cancel_task"
+  ];
+
   pythonImportsCheck = [ "pybalboa" ];
 
   meta = with lib; {