diff --git a/main.py b/main.py
index 92c410b..1ab9ac4 100644
--- a/main.py
+++ b/main.py
@@ -40,7 +40,7 @@ ChatFilter = F.chat.id.in_(set(map(int, os.environ['USERS'].split(','))))
 
 
 def format_tags(tags: Iterable[str]):
-    return ' '.join(f'#{tag}' for tag in tags) or 'None'
+    return ' '.join(f'#{re.sub(r"[^0-9a-zA-Z_]", "_", tag)}' for tag in tags) or 'None'
 
 
 def recover_url(file: E621PostFile):