diff --git a/src/include/netif/ppp/ppp.h b/src/include/netif/ppp/ppp.h
index 51c8af29..c9a1df4f 100644
--- a/src/include/netif/ppp/ppp.h
+++ b/src/include/netif/ppp/ppp.h
@@ -368,9 +368,7 @@ struct ppp_pcb_s {
   unsigned int                         :5; /* 5 bits of padding to round out to 16 bits */
 
 #if PPPOS_SUPPORT
-/* FIXME: there is probably one superfluous */
   ext_accm out_accm;             /* Async-Ctl-Char-Map for output. */
-  ext_accm xmit_accm;            /* extended transmit ACCM */
 #endif /* PPPOS_SUPPORT */
 
   u32_t last_xmit;               /* Time of last transmission. */
diff --git a/src/netif/ppp/lcp.c b/src/netif/ppp/lcp.c
index 5aa99da7..12fc0b65 100644
--- a/src/netif/ppp/lcp.c
+++ b/src/netif/ppp/lcp.c
@@ -396,24 +396,6 @@ static void lcp_init(ppp_pcb *pcb) {
     ao->neg_pcompression = 1;
     ao->neg_accompression = 1;
     ao->neg_endpoint = 1;
-
-#if PPPOS_SUPPORT
-    /*
-     * Set transmit escape for the flag and escape characters plus anything
-     * set for the allowable options.
-     */
-    memset(pcb->xmit_accm, 0, sizeof(ext_accm));
-    pcb->xmit_accm[15] = 0x60;
-    pcb->xmit_accm[0]  = (u_char)((ao->asyncmap        & 0xFF));
-    pcb->xmit_accm[1]  = (u_char)((ao->asyncmap >> 8)  & 0xFF);
-    pcb->xmit_accm[2]  = (u_char)((ao->asyncmap >> 16) & 0xFF);
-    pcb->xmit_accm[3]  = (u_char)((ao->asyncmap >> 24) & 0xFF);
-    LCPDEBUG(("lcp_init: xmit_accm=%X %X %X %X\n",
-	  pcb->xmit_accm[0],
-          pcb->xmit_accm[1],
-          pcb->xmit_accm[2],
-          pcb->xmit_accm[3]));
-#endif /* PPPOS_SUPPORT */
 }
 
 
@@ -469,36 +451,18 @@ void lcp_close(ppp_pcb *pcb, const char *reason) {
  */
 void lcp_lowerup(ppp_pcb *pcb) {
     lcp_options *wo = &pcb->lcp_wantoptions;
-#if PPPOS_SUPPORT
-    lcp_options *ao = &pcb->lcp_allowoptions;
-#endif /* PPPOS_SUPPORT */
     fsm *f = &pcb->lcp_fsm;
     /*
      * Don't use A/C or protocol compression on transmission,
      * but accept A/C and protocol compressed packets
      * if we are going to ask for A/C and protocol compression.
      */
-#if PPPOS_SUPPORT
-    ppp_set_xaccm(pcb, &pcb->xmit_accm);
-#endif /* PPPOS_SUPPORT */
     if (ppp_send_config(pcb, PPP_MRU, 0xffffffff, 0, 0) < 0
 	|| ppp_recv_config(pcb, PPP_MRU, (pcb->settings.lax_recv? 0: 0xffffffff),
 			   wo->neg_pcompression, wo->neg_accompression) < 0)
 	    return;
     pcb->peer_mru = PPP_MRU;
 
-#if PPPOS_SUPPORT
-    ao->asyncmap = (u_long)pcb->xmit_accm[0]
-                                   | ((u_long)pcb->xmit_accm[1] << 8)
-                                   | ((u_long)pcb->xmit_accm[2] << 16)
-                                   | ((u_long)pcb->xmit_accm[3] << 24);
-    LCPDEBUG(("lcp_lowerup: asyncmap=%X %X %X %X\n",
-              pcb->xmit_accm[3],
-              pcb->xmit_accm[2],
-              pcb->xmit_accm[1],
-              pcb->xmit_accm[0]));
-#endif /* PPPOS_SUPPORT */
-
     if (pcb->settings.listen_time != 0) {
 	f->flags |= DELAYED_UP;
 	TIMEOUTMS(lcp_delayed_up, f, pcb->settings.listen_time);
diff --git a/src/netif/ppp/ppp.c b/src/netif/ppp/ppp.c
index e481b20c..a8667763 100644
--- a/src/netif/ppp/ppp.c
+++ b/src/netif/ppp/ppp.c
@@ -194,22 +194,6 @@ static err_t ppp_netif_output(struct netif *netif, struct pbuf *pb, u_short prot
 /***********************************/
 /*** PUBLIC FUNCTION DEFINITIONS ***/
 /***********************************/
-
-#if PPPOS_SUPPORT
-/*
- * ppp_set_xaccm - set the extended transmit ACCM for the interface.
- */
-void ppp_set_xaccm(ppp_pcb *pcb, ext_accm *accm) {
-  SMEMCPY(pcb->out_accm, accm, sizeof(ext_accm));
-  PPPDEBUG(LOG_INFO, ("ppp_set_xaccm[%d]: out_accm=%X %X %X %X\n",
-            pcb->num,
-            pcb->out_accm[0],
-            pcb->out_accm[1],
-            pcb->out_accm[2],
-            pcb->out_accm[3]));
-}
-#endif /* PPPOS_SUPPORT */
-
 void ppp_set_auth(ppp_pcb *pcb, u8_t authtype, const char *user, const char *passwd) {
 
 #if PAP_SUPPORT