diff --git a/oml/item/models.py b/oml/item/models.py
index b8ac4ac..d98f832 100644
--- a/oml/item/models.py
+++ b/oml/item/models.py
@@ -730,7 +730,7 @@ class File(db.Model):
 
     def move(self):
         def format_underscores(string):
-            return re.sub(r'^\.|\.$|:|/|\?|<|>', '_', string)
+            return re.sub(r'^\.|\.$|:|/|\?|<|>|\\|\*', '_', string)
         prefs = settings.preferences
         prefix = os.sep.join(os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books/').split('/'))
         if not self.item: