diff --git a/chat/locales/en-US/irc.properties b/chat/locales/en-US/irc.properties
index f78c9722d7..544ca7d27e 100644
--- a/chat/locales/en-US/irc.properties
+++ b/chat/locales/en-US/irc.properties
@@ -148,7 +148,7 @@ message.ping=Ping reply from %1$S in #2 millisecond.;Ping reply from %1$S in #2
 
 
 # LOCALIZATION NOTE (error.*):
-#    These are shown as error messages in the server tab.
+#    These are shown as error messages in the conversation or server tab.
 #    %S is the channel name.
 error.noChannel=There is no channel: %S.
 error.tooManyChannels=Cannot join %S; you've joined too many channels.
@@ -173,6 +173,9 @@ error.notChannelOp=You are not a channel operator on %S.
 error.notChannelOwner=You are not a channel owner of %S.
 error.wrongKey=Cannot join %S, invalid channel password.
 error.sendMessageFailed=An error occurred while sending your last message. Please try again once the connection has been reestablished.
+#    %1$S is the channel the user tried to join, %2$S is the channel
+#    he was forwarded to.
+error.channelForward=You may not join %1$S, and were automatically redirected to %2$S.
 
 # LOCALIZATION NOTE (tooltip.*):
 #    These are the descriptions given in a tooltip with information received
diff --git a/chat/protocols/irc/ircNonStandard.jsm b/chat/protocols/irc/ircNonStandard.jsm
index 14a7a9f7a3..5b5d275bec 100644
--- a/chat/protocols/irc/ircNonStandard.jsm
+++ b/chat/protocols/irc/ircNonStandard.jsm
@@ -175,6 +175,17 @@ var ircNonStandard = {
              aMessage.params[1] == "Password required";
     },
 
+    "470": function(aMessage) { // Channel forward (Unreal, inspircd)
+      // <requested channel> <redirect channel>: You may not join this channel,
+      // so you are automatically being transferred to the redirect channel.
+      // Join redirect channel so when the automatic join happens, we are
+      // not surprised.
+      this.joinChat(this.getChatRoomDefaultFieldValues(aMessage.params[2]));
+      // Mark requested channel as left and add a system message.
+      return conversationErrorMessage(this, aMessage, "error.channelForward",
+        true, false);
+    },
+
     "499": function(aMessage) { // ERR_CHANOWNPRIVNEEDED (Unreal)
       // <channel> :You're not the channel owner (status +q is needed)
       return conversationErrorMessage(this, aMessage, "error.notChannelOwner");
diff --git a/chat/protocols/irc/ircUtils.jsm b/chat/protocols/irc/ircUtils.jsm
index 495dd2fb5e..63582a9ed8 100644
--- a/chat/protocols/irc/ircUtils.jsm
+++ b/chat/protocols/irc/ircUtils.jsm
@@ -221,7 +221,8 @@ function mIRCColoring(aStack, aInput) {
 function conversationErrorMessage(aAccount, aMessage, aError,
                                   aJoinFailed = false, aRejoinable = true) {
   let conv = aAccount.getConversation(aMessage.params[1]);
-  conv.writeMessage(aMessage.origin, _(aError, aMessage.params[1]),
+  conv.writeMessage(aMessage.origin, _(aError, aMessage.params[1],
+                                       aMessage.params[2] || undefined),
                     {error: true, system: true});
   delete conv._pendingMessage;