diff --git a/src/plugins/irc/irc-nick.c b/src/plugins/irc/irc-nick.c
index f4308f6ae..92940a6db 100644
--- a/src/plugins/irc/irc-nick.c
+++ b/src/plugins/irc/irc-nick.c
@@ -624,7 +624,7 @@ irc_nick_nicklist_set_color_all ()
 struct t_irc_nick *
 irc_nick_new (struct t_irc_server *server, struct t_irc_channel *channel,
               const char *nickname, const char *host, const char *prefixes,
-              int away, char *account)
+              int away, const char *account)
 {
     struct t_irc_nick *new_nick, *ptr_nick;
     int length;
diff --git a/src/plugins/irc/irc-nick.h b/src/plugins/irc/irc-nick.h
index 575421aca..3079a437b 100644
--- a/src/plugins/irc/irc-nick.h
+++ b/src/plugins/irc/irc-nick.h
@@ -66,7 +66,7 @@ extern struct t_irc_nick *irc_nick_new (struct t_irc_server *server,
                                         const char *host,
                                         const char *prefixes,
                                         int away,
-                                        char *account);
+                                        const char *account);
 extern void irc_nick_change (struct t_irc_server *server,
                              struct t_irc_channel *channel,
                              struct t_irc_nick *nick, const char *new_nick);