diff --git a/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py b/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py
index 309efdc308f1..4f3720776161 100644
--- a/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py
+++ b/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py
@@ -673,8 +673,12 @@ def _draft_extend_for_decode(
         # Batch 2: Draft extend
         draft_extend_input = EagleDraftExtendInput(
             hidden_states=batch_result.logits_output.hidden_states,
-            # Actual width: the multi-layer chain fills num_steps + 1 rows/req.
-            num_tokens_per_req=self.speculative_num_steps + 1,
+            # Actual width: the multi-layer chain fills num_steps + 1 rows/req,
+            # plus the boundary-KV front rows when the widened window is active
+            # (must match the capture width in the draft-extend graph runner).
+            num_tokens_per_req=self.speculative_num_steps
+            + 1
+            + self.draft_extend_num_front_tokens,
             num_tokens_for_logprob_per_req=1,
             num_front_tokens=self.draft_extend_num_front_tokens,
         )