diff --git a/oxweb/aaaarg.py b/oxweb/aaaarg.py
index cca6385..4e5462a 100644
--- a/oxweb/aaaarg.py
+++ b/oxweb/aaaarg.py
@@ -44,7 +44,7 @@ def getTextByLetter(letter):
         title = decodeHtml(r[2])
         author_foder =  canonicalName(author)
         author_foder = os.path.join(author_foder[0], author_foder)
-        filename = os.path.join(author_foder, '%s (aaarg %s).pdf' %  (title, id))
+        filename = os.path.join(author_foder, '%s (aaarg %s).pdf' %  (title.replace('/', '_'), id))
         texts.append({
             'author': author,
             'title': title,