diff --git a/vllm_ascend/attention/context_parallel/mla_cp.py b/vllm_ascend/attention/context_parallel/mla_cp.py
index 6ff20557336..c9c8bd0b1b5 100644
--- a/vllm_ascend/attention/context_parallel/mla_cp.py
+++ b/vllm_ascend/attention/context_parallel/mla_cp.py
@@ -69,6 +69,9 @@ def __init__(
                                               self.decode_threshold,
                                               dtype=torch.uint8,
                                               device=device)
+        self.block_size = (self.block_size *
+                           self.cp_virtual_block_size) // np.gcd(
+                               self.block_size, self.cp_virtual_block_size)
 
     def build(
         self,