diff --git a/include/modval.h b/include/modval.h
index 5c9dde0..56a5b1f 100644
--- a/include/modval.h
+++ b/include/modval.h
@@ -436,7 +436,7 @@ extern Function_ptr *global;
 #define fetch_userhost (*(char *(*)(int , char *))global[FETCH_USERHOST])
 #define create_channel_list (*(char *(*)(Window *))global[CREATE_CHANNEL_LIST])
 #define flush_channel_stats (*(void (*)(void ))global[FLUSH_CHANNEL_STATS])
-#define lookup_channel (*(ChannelList *(*)(char *, int, int))global[LOOKUP_CHANNEL])
+#define lookup_channel (*(ChannelList *(*)(const char *, int, int))global[LOOKUP_CHANNEL])
 
 /* hash.c */
 #define find_nicklist_in_channellist (*(NickList *(*)(char *, ChannelList *, int))global[FIND_NICKLIST_IN_CHANNELLIST])
diff --git a/include/names.h b/include/names.h
index 7307478..a41366b 100644
--- a/include/names.h
+++ b/include/names.h
@@ -54,7 +54,7 @@ int		is_channel_mode (char *, int, int);
 int		BX_is_chanop (char *, char *);
 int		BX_is_halfop (char *, char *);
 char		*is_chanoper (char *, char *);
-ChannelList	*BX_lookup_channel (char *, int, int);
+ChannelList	*BX_lookup_channel (const char *, int, int);
 char		*BX_get_channel_mode (char *, int);
 #ifdef	INCLUDE_UNUSED_FUNCTIONS
 void		set_channel_mode (char *, int, char *);
diff --git a/source/names.c b/source/names.c
index 5744d4a..cf8efee 100644
--- a/source/names.c
+++ b/source/names.c
@@ -105,7 +105,7 @@ NickList *Nick, *n;
 	chan->totalnicks = 0;
 }
 
-extern	ChannelList *BX_lookup_channel(char *channel, int server, int unlink)
+ChannelList *BX_lookup_channel(const char *channel, int server, int unlink)
 {
 	register ChannelList	*chan = NULL,
 				*last = NULL;