diff --git a/pkgs/development/python-modules/ddt/default.nix b/pkgs/development/python-modules/ddt/default.nix
index ec48d55048ea..f0def3a3ad38 100644
--- a/pkgs/development/python-modules/ddt/default.nix
+++ b/pkgs/development/python-modules/ddt/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, pythonOlder
 
 # build-system
 , setuptools
@@ -27,6 +28,9 @@ buildPythonPackage rec {
     setuptools
   ];
 
+  # aiounittest is not compatible with Python 3.12.
+  doCheck = pythonOlder "3.12";
+
   nativeCheckInputs = [
     aiounittest
     mock