diff --git a/python/sglang/srt/layers/attention/dsa_backend.py b/python/sglang/srt/layers/attention/dsa_backend.py
index eb48fd0ac..18066b0db 100644
--- a/python/sglang/srt/layers/attention/dsa_backend.py
+++ b/python/sglang/srt/layers/attention/dsa_backend.py
@@ -1003,11 +1003,11 @@ class DeepseekSparseAttnBackend(
                 max_bs + 1, dtype=torch.int32, device=self.device
             ),
             # fake page_table for sparse_prefill
-            # Add extra columns for speculative draft tokens to avoid
-            # overflow during target_verify when max_seqlen_k = seq_len + num_draft_tokens
+            # Match req_to_token's width exactly. It is over-allocated beyond
+            # context_len because spec decoding lets seq_len transiently overshoot.
             "page_table": torch.zeros(
                 max_num_tokens,
-                self.max_context_len + (self.speculative_num_draft_tokens or 0),
+                self.req_to_token.shape[1],
                 dtype=torch.int32,
                 device=self.device,
             ),