diff --git a/discord/ext/commands/bot.py b/discord/ext/commands/bot.py
index f2b7a8067..c5e1a1c47 100644
--- a/discord/ext/commands/bot.py
+++ b/discord/ext/commands/bot.py
@@ -795,7 +795,7 @@ class BotBase(GroupMixin):
         """
         prefix = ret = self.command_prefix
         if callable(prefix):
-            ret = await discord.utils.maybe_coroutine(prefix, self, ret)
+            ret = await discord.utils.maybe_coroutine(prefix, self, message)
 
         if isinstance(ret, (list, tuple)):
             ret = [p for p in ret if p]