diff --git a/discord/ext/commands/bot.py b/discord/ext/commands/bot.py
index 2f07a85f1..0e83c3f7b 100644
--- a/discord/ext/commands/bot.py
+++ b/discord/ext/commands/bot.py
@@ -108,7 +108,7 @@ class BotBase(GroupMixin):
         self._help_command = None
         self.description = inspect.cleandoc(description) if description else ''
         self.owner_id = options.get('owner_id')
-        self.owner_ids = options.get('owner_ids', {})
+        self.owner_ids = options.get('owner_ids', set())
 
         if self.owner_id and self.owner_ids:
             raise TypeError('Both owner_id and owner_ids are set.')