diff --git a/tests/rest/admin/test_room.py b/tests/rest/admin/test_room.py
index 30b2de26e4..4d90b83b06 100644
--- a/tests/rest/admin/test_room.py
+++ b/tests/rest/admin/test_room.py
@@ -861,7 +861,7 @@ class DeleteRoomV2TestCase(unittest.HomeserverTestCase):
         # Mock PaginationHandler.purge_room to sleep for 100s, so we have time to do a second call
         # before the purge is over. Note that it doesn't purge anymore, but we don't care.
         async def purge_room(room_id: str, force: bool) -> None:
-            await deferLater(self.hs.get_reactor(), 100, lambda: None)
+            await self.hs.get_clock().sleep(100)
 
         self.pagination_handler.purge_room = AsyncMock(side_effect=purge_room)  # type: ignore[method-assign]