diff --git a/src/chmode.c b/src/chmode.c
index 38393b2a..b6c761dd 100644
--- a/src/chmode.c
+++ b/src/chmode.c
@@ -1664,7 +1664,10 @@ set_channel_mode(struct Client *client_p, struct Client *source_p,
 		default:
 			/* If this mode char is locked, don't allow local users to change it. */
 			if (MyClient(source_p) && chptr->mode_lock && strchr(chptr->mode_lock, c))
+			{
+				sendto_one_numeric(source_p, ERR_MLOCKRESTRICTED, form_str(ERR_MLOCKRESTRICTED), chptr->name, c, chptr->mode_lock);
 				continue;
+			}
 			chmode_table[(unsigned char) c].set_func(fakesource_p, chptr, alevel,
 				       parc, &parn, parv,
 				       &errors, dir, c,
diff --git a/src/messages.tab b/src/messages.tab
index 0660e6c0..71600d56 100644
--- a/src/messages.tab
+++ b/src/messages.tab
@@ -756,7 +756,7 @@ static  const char *  replies[] = {
 /* 732 RPL_MONLIST */		":%s 732 %s :%s",
 /* 733 RPL_ENDOFMONLIST */	":%s 733 %s :End of MONITOR list",
 /* 734 ERR_MONLISTFULL */	":%s 734 %s %d %s :Monitor list is full",
-/* 735 ERR_MLOCKRESTRICTED */	"%s %c :This mode cannot be set because it is restricted to Services only.",
+/* 735 ERR_MLOCKRESTRICTED */	"%s %c %s :MODE cannot be set due to channel having an active MLOCK restriction policy",
 /* 736 */	NULL,
 /* 737 */	NULL,
 /* 738 */	NULL,