diff --git a/vllm/v1/attention/backends/mla/flashmla_sparse.py b/vllm/v1/attention/backends/mla/flashmla_sparse.py
index 433cded567..d8c4368401 100644
--- a/vllm/v1/attention/backends/mla/flashmla_sparse.py
+++ b/vllm/v1/attention/backends/mla/flashmla_sparse.py
@@ -634,6 +634,7 @@ class FlashMLASparseMetadataBuilder(
 class FlashMLASparseImpl(SparseMLACommonImpl[FlashMLASparseMetadata]):
     can_return_lse_for_decode: bool = True
     supports_dcp: bool = True
+    supports_mtp_with_cp_non_trivial_interleave_size: bool = True
 
     @staticmethod
     def _compute_fp8_decode_padded_heads(num_heads: int) -> int: