diff --git a/tests/meticulous/assignor/test_copartitioned_assignor.py b/tests/meticulous/assignor/test_copartitioned_assignor.py
index e0fb1f66b..d78ceea8c 100644
--- a/tests/meticulous/assignor/test_copartitioned_assignor.py
+++ b/tests/meticulous/assignor/test_copartitioned_assignor.py
@@ -8,7 +8,13 @@
 from faust.assignor.client_assignment import CopartitionedAssignment
 from faust.assignor.copartitioned_assignor import CopartitionedAssignor
 
-TEST_DEADLINE = 4000
+# These Hypothesis property tests assert assignment *correctness*, not
+# performance.  PyPy's JIT warmup makes a single example's timing vary by
+# well over a second, so a fixed deadline is tripped intermittently
+# (DeadlineExceeded -> FlakyFailure) even though the assignment is valid --
+# flaking the PyPy CI leg.  Disable the deadline; the job's own timeout still
+# guards against a real hang.
+TEST_DEADLINE = None
 
 
 _topics = {"foo", "bar", "baz"}