diff --git a/scripts/synthesize/32_reprocess_missing_pages.py b/scripts/synthesize/32_reprocess_missing_pages.py
index 37ad996..7c26ab7 100644
--- a/scripts/synthesize/32_reprocess_missing_pages.py
+++ b/scripts/synthesize/32_reprocess_missing_pages.py
@@ -321,6 +321,10 @@ def process_one_page(doc_id: str, page_num: int) -> tuple[bool, int]:
         except Exception as e:
             print(f"  [ERR ] {doc_id} p{page_num:03d} — integrate: {e}", flush=True)
             return (False, 0)
+        # Keep total_pages in sync with the real max page (recovered pages extend it)
+        max_page = max((c.get("page", 0) for c in idx.get("chunks") or []), default=0)
+        if max_page > idx.get("total_pages", 0):
+            idx["total_pages"] = max_page
         idx_path.write_text(json.dumps(idx, indent=2, ensure_ascii=False), encoding="utf-8")
     print(f"  [OK  ] {doc_id} p{page_num:03d} — {n} chunks", flush=True)
     return (True, n)