diff --git a/python/sglang/lang/ir.py b/python/sglang/lang/ir.py
index 43da723b8..f3527d1c9 100644
--- a/python/sglang/lang/ir.py
+++ b/python/sglang/lang/ir.py
@@ -30,9 +30,9 @@ class SglSamplingParams:
     presence_penalty: float = 0.0
     ignore_eos: bool = False
     return_logprob: Optional[bool] = None
-    logprob_start_len: Optional[int] = (None,)
-    top_logprobs_num: Optional[int] = (None,)
-    return_text_in_logprobs: Optional[bool] = (None,)
+    logprob_start_len: Optional[int] = None
+    top_logprobs_num: Optional[int] = None
+    return_text_in_logprobs: Optional[bool] = None
     json_schema: Optional[str] = None
 
     # for constrained generation, not included in to_xxx_kwargs
diff --git a/python/sglang/srt/mem_cache/hicache_storage.py b/python/sglang/srt/mem_cache/hicache_storage.py
index 63ed143d7..b384d4cdc 100644
--- a/python/sglang/srt/mem_cache/hicache_storage.py
+++ b/python/sglang/srt/mem_cache/hicache_storage.py
@@ -36,7 +36,7 @@ class HiCacheStorageConfig:
 
 @dataclass
 class HiCacheStorageExtraInfo:
-    prefix_keys: Optional[List[str]] = (None,)
+    prefix_keys: Optional[List[str]] = None
     extra_info: Optional[dict] = None