diff --git a/modules/core/m_mode.c b/modules/core/m_mode.c
index 5549203..e00eff2 100644
--- a/modules/core/m_mode.c
+++ b/modules/core/m_mode.c
@@ -59,7 +59,7 @@ struct Message tmode_msgtab = {
 };
 struct Message mlock_msgtab = {
 	"MLOCK", 0, 0, 0, MFLG_SLOW,
-	{mg_ignore, mg_ignore, {ms_mlock, 4}, {ms_mlock, 4}, mg_ignore, mg_ignore}
+	{mg_ignore, mg_ignore, {ms_mlock, 3}, {ms_mlock, 3}, mg_ignore, mg_ignore}
 };
 struct Message bmask_msgtab = {
 	"BMASK", 0, 0, 0, MFLG_SLOW,
diff --git a/src/chmode.c b/src/chmode.c
index 042fbea..a676d0a 100644
--- a/src/chmode.c
+++ b/src/chmode.c
@@ -2246,8 +2246,9 @@ set_channel_mlock(struct Client *client_p, struct Client *source_p,
 		  struct Channel *chptr, const char *newmlock)
 {
 	rb_free(chptr->mode_lock);
-	chptr->mode_lock = rb_strdup(newmlock);
+	chptr->mode_lock = newmlock ? rb_strdup(newmlock) : NULL;
 
-	sendto_server(client_p, NULL, CAP_TS6 | CAP_MLOCK, NOCAPS, ":%s MLOCK %ld %s %s",
-		      source_p->id, (long) chptr->channelts, chptr->chname, chptr->mode_lock);
+	sendto_server(client_p, NULL, CAP_TS6 | CAP_MLOCK, NOCAPS, ":%s MLOCK %ld %s :%s",
+		      source_p->id, (long) chptr->channelts, chptr->chname,
+		      chptr->mode_lock ? chptr->mode_lock : "");
 }
diff --git a/src/s_serv.c b/src/s_serv.c
index 65e8e0f..5f272b0 100644
--- a/src/s_serv.c
+++ b/src/s_serv.c
@@ -679,9 +679,9 @@ burst_TS6(struct Client *client_p)
 				   chptr->topic);
 
 		if(IsCapable(client_p, CAP_MLOCK))
-			sendto_one(client_p, ":%s MLOCK %ld %s %s",
+			sendto_one(client_p, ":%s MLOCK %ld %s :%s",
 				   me.id, (long) chptr->channelts, chptr->chname,
-				   channel_mlock(chptr, client_p));
+				   EmptyString(chptr->mode_lock) ? "" : chptr->mode_lock);
 
 		hchaninfo.chptr = chptr;
 		call_hook(h_burst_channel, &hchaninfo);