diff --git a/vllm/worker/model_runner.py b/vllm/worker/model_runner.py
index dc1674cd1ea2..551f54b68ce6 100644
--- a/vllm/worker/model_runner.py
+++ b/vllm/worker/model_runner.py
@@ -828,7 +828,7 @@ def build(self) -> ModelInputForGPU:
 
         cuda_graph_pad_size = self._get_cuda_graph_pad_size(
             num_seqs=len(seq_lens),
-            max_decode_seq_len=max_encoder_seq_len,
+            max_decode_seq_len=max_decode_seq_len,
             max_encoder_seq_len=max_encoder_seq_len)
 
         batch_size = len(input_tokens)