diff --git a/vllm/v1/attention/backends/mamba1_attn.py b/vllm/v1/attention/backends/mamba1_attn.py
index bf0c68b65..c7228ecea 100644
--- a/vllm/v1/attention/backends/mamba1_attn.py
+++ b/vllm/v1/attention/backends/mamba1_attn.py
@@ -29,4 +29,3 @@ class Mamba1AttentionMetadataBuilder(
     BaseMambaAttentionMetadataBuilder[Mamba1AttentionMetadata]
 ):
     metadata_cls = Mamba1AttentionMetadata
-    supports_update_block_table: bool = False