diff --git a/vllm/core/scheduler.py b/vllm/core/scheduler.py
index 06df11a8f0e73..0764eb3a6bf11 100644
--- a/vllm/core/scheduler.py
+++ b/vllm/core/scheduler.py
@@ -1086,7 +1086,7 @@ def _can_append_slots(self, seq_group: SequenceGroup) -> bool:
         )
 
     def _allow_async_output_proc(self, seq_group: SequenceGroup) -> bool:
-        no_beam_search = (seq_group.sampling_params.n == 1
+        no_beam_search = (seq_group.sampling_params.best_of == 1
                           and not seq_group.sampling_params.use_beam_search)
 
         return no_beam_search