diff --git a/vllm/v1/attention/backends/mla/indexer.py b/vllm/v1/attention/backends/mla/indexer.py
index ded321834607..28d7e11b7801 100644
--- a/vllm/v1/attention/backends/mla/indexer.py
+++ b/vllm/v1/attention/backends/mla/indexer.py
@@ -164,6 +164,10 @@ def get_name() -> str:
     def get_supported_kernel_block_sizes() -> list[int | MultipleOf]:
         return [256]
 
+    @staticmethod
+    def get_builder_cls() -> type["DeepseekV32IndexerMetadataBuilder"]:
+        return DeepseekV4IndexerMetadataBuilder
+
 
 @dataclass
 class DeepseekV32IndexerPrefillChunkMetadata:
@@ -638,6 +642,10 @@ def build(
         return attn_metadata
 
 
+class DeepseekV4IndexerMetadataBuilder(DeepseekV32IndexerMetadataBuilder):
+    natively_supported_next_n_fp4: list[int] = [1]
+
+
 def build_prefill_chunk_metadata(
     start_idx: int,
     end_idx: int,