diff --git a/python/ray/tests/test_memory_pressure.py b/python/ray/tests/test_memory_pressure.py
index cb218c33a60c..b405822b5620 100644
--- a/python/ray/tests/test_memory_pressure.py
+++ b/python/ray/tests/test_memory_pressure.py
@@ -52,6 +52,10 @@ def ray_with_memory_monitor(shutdown_only):
             "task_oom_retries": task_oom_retries,
             "min_memory_free_bytes": -1,
             "task_oom_retry_delay_base_ms": 0,
+            # PR #62643 flipped the default OOM killing policy to the
+            # time-based multi-worker policy; these tests assert on
+            # single-worker, owner-group semantics.
+            "worker_killing_policy_by_group": True,
         },
     ) as addr:
         yield addr
@@ -70,6 +74,7 @@ def ray_with_memory_monitor_no_oom_retry(shutdown_only):
             "task_oom_retries": 0,
             "min_memory_free_bytes": -1,
             "task_oom_retry_delay_base_ms": 0,
+            "worker_killing_policy_by_group": True,
         },
     ) as addr:
         yield addr