diff --git a/crawler.py b/crawler.py
index fa760b6..8a70eee 100644
--- a/crawler.py
+++ b/crawler.py
@@ -333,7 +333,8 @@ def save_readme(bios, out):
     md += "| Partei | Abgeordnete |\n"
     md += "|--------|------------:|\n"
     for party, count in sorted(parties.items()):
-        md += f"| [{party}](Parteien/{party}.md) | {count} |\n"
+        safe_party = re.sub(r'[/<>:"|?*]', "_", party)
+        md += f"| [{party}](Parteien/{safe_party}.md) | {count} |\n"
     md += f"\n## Verzeichnisse\n\n"
     md += "- [Abgeordnete](Abgeordnete/) — Einzelprofile nach Nachname\n"
     md += "- [Abstimmungen](Abstimmungen/) — Abstimmungen nach Thema\n"
@@ -357,7 +358,8 @@ def save_party_index(bios, out):
             if bio.job:
                 md += f" — {bio.job}"
             md += "\n"
-        with open(f"{dir}/{party}.md", "w", encoding="utf-8") as f:
+        safe_party = re.sub(r'[/<>:"|?*]', "_", party)
+        with open(f"{dir}/{safe_party}.md", "w", encoding="utf-8") as f:
             f.write(md)