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--- a/Allura/allura/model/notification.py
+++ b/Allura/allura/model/notification.py
@@ -148,17 +148,13 @@
             file_info = kwargs.pop('file_info', None)
             if file_info is not None:
                 text = "%s\n\n\nAttachment:" % text
-                if isinstance(file_info, list):
-                    for attach in file_info:
-                        attach.file.seek(0, 2)
-                        bytecount = attach.file.tell()
-                        attach.file.seek(0)
-                        text = "%s %s (%s; %s) " % (text, attach.filename, h.do_filesizeformat(bytecount), attach.type)
-                else:
-                    file_info.file.seek(0, 2)
-                    bytecount = file_info.file.tell()
-                    file_info.file.seek(0)
-                    text = "%s %s (%s; %s) " % (text, file_info.filename, h.do_filesizeformat(bytecount), file_info.type)
+                if not isinstance(file_info, list):
+                    file_info = [file_info]
+                for attach in file_info:
+                    attach.file.seek(0, 2)
+                    bytecount = attach.file.tell()
+                    attach.file.seek(0)
+                    text = "%s %s (%s; %s) " % (text, attach.filename, h.do_filesizeformat(bytecount), attach.type)
 
             subject = post.subject or ''
             if post.parent_id and not subject.lower().startswith('re:'):