diff --git a/protocols/clientbot.py b/protocols/clientbot.py
index 40aa8b1..43a2c5c 100644
--- a/protocols/clientbot.py
+++ b/protocols/clientbot.py
@@ -142,7 +142,6 @@ class ClientbotWrapperProtocol(IRCCommonProtocol):
 
     def join(self, client, channel):
         """STUB: Joins a user to a channel."""
-        channel = self.to_lower(channel)
 
         # Only joins for the main PyLink client are actually forwarded. Others are ignored.
         # Note: we do not automatically add our main client to the channel state, as we
diff --git a/protocols/inspircd.py b/protocols/inspircd.py
index 30a6b2c..758a012 100644
--- a/protocols/inspircd.py
+++ b/protocols/inspircd.py
@@ -76,7 +76,6 @@ class InspIRCdProtocol(TS6BaseProtocol):
         # InspIRCd doesn't distinguish between burst joins and regular joins,
         # so what we're actually doing here is sending FJOIN from the server,
         # on behalf of the clients that are joining.
-        channel = self.to_lower(channel)
 
         server = self.get_server(client)
         if not self.is_internal_server(server):
@@ -102,7 +101,6 @@ class InspIRCdProtocol(TS6BaseProtocol):
             sjoin('100', '#test', [('', '100AAABBC'), ('qo', 100AAABBB'), ('h', '100AAADDD')])
             sjoin(self.sid, '#test', [('o', self.pseudoclient.uid)])
         """
-        channel = self.to_lower(channel)
         server = server or self.sid
         assert users, "sjoin: No users sent?"
         log.debug('(%s) sjoin: got %r for users', self.name, users)
diff --git a/protocols/ircs2s_common.py b/protocols/ircs2s_common.py
index 8ec5809..ee6ec75 100644
--- a/protocols/ircs2s_common.py
+++ b/protocols/ircs2s_common.py
@@ -371,7 +371,6 @@ class IRCS2SProtocol(IRCCommonProtocol):
                 (not self.is_internal_server(numeric)):
             raise LookupError('No such PyLink client/server exists.')
 
-        channel = self.to_lower(channel)
         if not reason:
             reason = 'No reason given'
 
@@ -394,7 +393,6 @@ class IRCS2SProtocol(IRCCommonProtocol):
 
     def part(self, client, channel, reason=None):
         """Sends a part from a PyLink client."""
-        channel = self.to_lower(channel)
         if not self.is_internal_client(client):
             log.error('(%s) Error trying to part %r from %r (no such client exists)', self.name, client, channel)
             raise LookupError('No such PyLink client exists.')
diff --git a/protocols/ngircd.py b/protocols/ngircd.py
index 1aec880..0573463 100644
--- a/protocols/ngircd.py
+++ b/protocols/ngircd.py
@@ -149,7 +149,6 @@ class NgIRCdProtocol(IRCS2SProtocol):
         self.users[source].away = text
 
     def join(self, client, channel):
-        channel = self.to_lower(channel)
 
         if not self.is_internal_client(client):
             raise LookupError('No such PyLink client exists.')
@@ -224,7 +223,6 @@ class NgIRCdProtocol(IRCS2SProtocol):
             sjoin('100', '#test', [('', 'user0@0'), ('o', user1@1'), ('v', 'someone@2')])
             sjoin(self.sid, '#test', [('o', self.pseudoclient.uid)])
         """
-        channel = self.to_lower(channel)
 
         server = server or self.sid
         if not server:
@@ -365,7 +363,6 @@ class NgIRCdProtocol(IRCS2SProtocol):
                     self.apply_modes(channel, [('+' + status, source)])
             except ValueError:
                 channel = chanpair
-            channel = self.to_lower(channel)
 
             c = self.channels[channel]
 
diff --git a/protocols/ts6.py b/protocols/ts6.py
index cae9ef5..b447e33 100644
--- a/protocols/ts6.py
+++ b/protocols/ts6.py
@@ -66,7 +66,6 @@ class TS6Protocol(TS6BaseProtocol):
 
     def join(self, client, channel):
         """Joins a PyLink client to a channel."""
-        channel = self.to_lower(channel)
         # JOIN:
         # parameters: channelTS, channel, '+' (a plus sign)
         if not self.is_internal_client(client):
@@ -96,7 +95,6 @@ class TS6Protocol(TS6BaseProtocol):
         # their status ('@+', '@', '+' or ''), for example:
         # '@+1JJAAAAAB +2JJAAAA4C 1JJAAAADS'. All users must be behind the source server
         # so it is not possible to use this message to force users to join a channel.
-        channel = self.to_lower(channel)
         server = server or self.sid
         assert users, "sjoin: No users sent?"
         log.debug('(%s) sjoin: got %r for users', self.name, users)
diff --git a/protocols/unreal.py b/protocols/unreal.py
index 25448d2..cfb91a7 100644
--- a/protocols/unreal.py
+++ b/protocols/unreal.py
@@ -103,7 +103,6 @@ class UnrealProtocol(TS6BaseProtocol):
 
     def join(self, client, channel):
         """Joins a PyLink client to a channel."""
-        channel = self.to_lower(channel)
         if not self.is_internal_client(client):
             raise LookupError('No such PyLink client exists.')
         self._send_with_prefix(client, "JOIN %s" % channel)
@@ -122,7 +121,6 @@ class UnrealProtocol(TS6BaseProtocol):
             sjoin(self.sid, '#test', [('o', self.pseudoclient.uid)])
         """
         # <- :001 SJOIN 1444361345 #test :*@+1JJAAAAAB %2JJAAAA4C 1JJAAAADS
-        channel = self.to_lower(channel)
         server = server or self.sid
         assert users, "sjoin: No users sent?"
         if not server:
@@ -549,11 +547,7 @@ class UnrealProtocol(TS6BaseProtocol):
 
         else:
             for channel in args[0].split(','):
-                # Normalize channel case.
-                channel = self.to_lower(channel)
-
                 c = self.channels[channel]
-
                 self.users[numeric].channels.add(channel)
                 self.channels[channel].users.add(numeric)
                 # Call hooks manually, because one JOIN command in UnrealIRCd can