diff --git a/vllm/v1/core/single_type_kv_cache_manager.py b/vllm/v1/core/single_type_kv_cache_manager.py
index e6f65da36e413..4eeea533464c9 100644
--- a/vllm/v1/core/single_type_kv_cache_manager.py
+++ b/vllm/v1/core/single_type_kv_cache_manager.py
@@ -787,7 +787,7 @@ class CrossAttentionManager(SingleTypeKVCacheManager):
 class SinkFullAttentionManager(FullAttentionManager):
     def __init__(
         self,
-        kv_cache_spec: KVCacheSpec,
+        kv_cache_spec: SinkFullAttentionSpec,
         block_pool: BlockPool,
         kv_cache_group_id: int,
         dcp_world_size: int = 1,
diff --git a/vllm/v1/kv_cache_interface.py b/vllm/v1/kv_cache_interface.py
index 656f5e7b81f55..c0ab66f7081f7 100644
--- a/vllm/v1/kv_cache_interface.py
+++ b/vllm/v1/kv_cache_interface.py
@@ -299,7 +299,7 @@ class CrossAttentionSpec(AttentionSpec):
         return cdiv(max_encoder_len, self.block_size) * self.page_size_bytes
 
 
-@dataclass(forzen=True)
+@dataclass(frozen=True)
 class SinkFullAttentionSpec(FullAttentionSpec):
     sink_len: int | None = None