diff --git a/client.go b/client.go
index c1d12ce..a86cec7 100644
--- a/client.go
+++ b/client.go
@@ -197,6 +197,8 @@ func (c *Client) reply(code replyCode, args ...string) {
 		c.outputChan <- fmt.Sprintf(":%s 464 %s :Error, password incorrect", c.server.name, c.nick)
 	case errNoPriv:
 		c.outputChan <- fmt.Sprintf(":%s 481 %s :Permission denied", c.server.name, c.nick)
+	case errCannotSend:
+		c.outputChan <- fmt.Sprintf(":%s 404 %s %s :Cannot send to channel", c.server.name, c.nick, args[0])
 	}
 }
 
diff --git a/rosella.go b/rosella.go
index f799d20..4b71ab2 100644
--- a/rosella.go
+++ b/rosella.go
@@ -79,4 +79,5 @@ const (
 	errNotReg
 	errPassword
 	errNoPriv
+	errCannotSend
 )