diff --git a/slack_backup/reporters.py b/slack_backup/reporters.py
index 1f2d1db..c7f5d9f 100644
--- a/slack_backup/reporters.py
+++ b/slack_backup/reporters.py
@@ -94,6 +94,7 @@ class Reporter(object):
         for channel in all_channels:
             if channel.name in selected_channels:
                 result.append(channel)
+        return result
 
     def _msg_join(self, msg, text):
         """return formatter for join"""