diff --git a/scripts/readme_toc.py b/scripts/readme_toc.py
index b6ab0a65..90fdc3ab 100755
--- a/scripts/readme_toc.py
+++ b/scripts/readme_toc.py
@@ -87,8 +87,9 @@ def check_or_fix(readme_path: Path, fix: bool) -> int:
     # extract current ToC list items
     current_block = lines[begin_idx + 1 : end_idx]
     current = [l for l in current_block if l.lstrip().startswith("- [")]
-    # generate expected ToC
-    expected = generate_toc_lines(content)
+    # generate expected ToC from content without current ToC
+    toc_content = lines[:begin_idx] + lines[end_idx+1:]
+    expected = generate_toc_lines("\n".join(toc_content))
     if current == expected:
         return 0
     if not fix:
@@ -108,7 +109,7 @@ def check_or_fix(readme_path: Path, fix: bool) -> int:
         return 1
     # rebuild file with updated ToC
     prefix = lines[: begin_idx + 1]
-    suffix = lines[end_idx:]
+    suffix = lines[end_idx+1:]
     new_lines = prefix + [""] + expected + [""] + suffix
     readme_path.write_text("\n".join(new_lines) + "\n", encoding="utf-8")
     print(f"Updated ToC in {readme_path}.")