diff --git a/src/include/netif/ppp/pppos.h b/src/include/netif/ppp/pppos.h
index 380a965c..31abfa17 100644
--- a/src/include/netif/ppp/pppos.h
+++ b/src/include/netif/ppp/pppos.h
@@ -50,7 +50,6 @@ extern "C" {
  * completed. */
 enum {
   PDIDLE = 0,  /* Idle state - waiting. */
-  PDSTART,     /* Process start flag. */
   PDADDRESS,   /* Process address field. */
   PDCONTROL,   /* Process control field. */
   PDPROTOCOL1, /* Process protocol field 1. */
diff --git a/src/netif/ppp/pppos.c b/src/netif/ppp/pppos.c
index afa65bae..c4a0bd09 100644
--- a/src/netif/ppp/pppos.c
+++ b/src/netif/ppp/pppos.c
@@ -593,17 +593,8 @@ pppos_input(ppp_pcb *ppp, u8_t *s, int l)
 
       /* Process character relative to current state. */
       switch (pppos->in_state) {
-        case PDIDLE:                    /* Idle state - waiting. */
-          /* Drop the character if it's not 0xff
-           * we would have processed a flag character above. */
-          if (cur_char != PPP_ALLSTATIONS) {
-            break;
-          }
-          /* Fall through */
-        case PDSTART:                   /* Process start flag. */
-          /* Prepare for a new packet. */
-          pppos->in_fcs = PPP_INITFCS;
-          /* Fall through */
+        case PDIDLE:                    /* Idle state - wait for flag character. */
+          break;
         case PDADDRESS:                 /* Process address field. */
           if (cur_char == PPP_ALLSTATIONS) {
             pppos->in_state = PDCONTROL;
@@ -664,7 +655,7 @@ pppos_input(ppp_pcb *ppp, u8_t *s, int l)
               PPPDEBUG(LOG_ERR, ("pppos_input[%d]: NO FREE PBUFS!\n", ppp->netif->num));
               LINK_STATS_INC(link.memerr);
               pppos_input_drop(pppos);
-              pppos->in_state = PDSTART;  /* Wait for flag sequence. */
+              pppos->in_state = PDIDLE;  /* Wait for flag character. */
               break;
             }
             if (pppos->in_head == NULL) {