diff --git a/hypothesis-python/tox.ini b/hypothesis-python/tox.ini
index 1e352cb287..ab6b2f771b 100644
--- a/hypothesis-python/tox.ini
+++ b/hypothesis-python/tox.ini
@@ -17,7 +17,7 @@ passenv=
 setenv=
     # PYTHONWARNDEFAULTENCODING=1  # TODO: enable this
     brief: HYPOTHESIS_PROFILE=speedy
-    py312: PYTHONWARNINGS=ignore:ast.:DeprecationWarning
+    py312: PYTHONWARNINGS=ignore::DeprecationWarning
 commands =
     full: bash scripts/basic-test.sh
     brief: python -bb -X dev -m pytest -n auto tests/cover/test_testdecorators.py {posargs}