diff --git a/src/core/inet.c b/src/core/inet.c
index 818f7ba9..694cb002 100644
--- a/src/core/inet.c
+++ b/src/core/inet.c
@@ -300,9 +300,10 @@ inet_chksum_pbuf(struct pbuf *p)
 /* Convert numeric IP address into decimal dotted ASCII representation.
  * returns ptr to static buffer; not reentrant!
  */
-u8_t *inet_ntoa(u32_t addr)
+char *inet_ntoa(struct in_addr addr)
 {
   static u8_t str[16];
+  u32_t s_addr = addr.s_addr;
   u8_t inv[3];
   u8_t *rp;
   u8_t *ap;
@@ -311,7 +312,7 @@ u8_t *inet_ntoa(u32_t addr)
   u8_t i;
 
   rp = str;
-  ap = (u8_t *)&addr;
+  ap = (u8_t *)&s_addr;
   for(n = 0; n < 4; n++) {
     i = 0;
     do {
diff --git a/src/include/ipv4/lwip/inet.h b/src/include/ipv4/lwip/inet.h
index 01bd8a89..beab8518 100644
--- a/src/include/ipv4/lwip/inet.h
+++ b/src/include/ipv4/lwip/inet.h
@@ -46,7 +46,7 @@ u16_t inet_chksum_pseudo(struct pbuf *p,
 
 u32_t inet_addr(const char *cp);
 int inet_aton(const char *cp, struct in_addr *addr);
-u8_t *inet_ntoa(u32_t addr); /* returns ptr to static buffer; not reentrant! */
+char *inet_ntoa(struct in_addr addr); /* returns ptr to static buffer; not reentrant! */
 
 #ifdef htons
 #undef htons
diff --git a/src/netif/ppp/ipcp.c b/src/netif/ppp/ipcp.c
index 67c2061b..3da1ba67 100644
--- a/src/netif/ppp/ipcp.c
+++ b/src/netif/ppp/ipcp.c
@@ -178,6 +178,20 @@ static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
 /*** LOCAL FUNCTION DEFINITIONS ***/
 /**********************************/
 
+/*
+ * Non-standard inet_ntoa left here for compat with original ppp
+ * sources. Assumes u32_t instead of struct in_addr.
+ */ 
+
+char * _inet_ntoa(u32_t n)
+{
+	struct in_addr ia;
+	ia.s_addr = n;
+	return inet_ntoa(ia);
+}
+
+#define inet_ntoa _inet_ntoa
+
 /*
  * ipcp_init - Initialize IPCP.
  */