diff --git a/redbot/cogs/mutes/mutes.py b/redbot/cogs/mutes/mutes.py
index 06dbbf202..b6642bb50 100644
--- a/redbot/cogs/mutes/mutes.py
+++ b/redbot/cogs/mutes/mutes.py
@@ -334,7 +334,7 @@ class Mutes(VoiceMutes, commands.Cog, metaclass=CompositeMetaClass):
             if not result:
                 continue
             _mmeber, channel, reason = result
-            unmuted_channels.pop(channel)
+            unmuted_channels.remove(channel)
         modlog_reason = _("Automatic unmute")
 
         channel_list = humanize_list([c.mention for c in unmuted_channels if c is not None])