diff --git a/lib/libwebsockets.c b/lib/libwebsockets.c
index d1d95807..ad081ec1 100644
--- a/lib/libwebsockets.c
+++ b/lib/libwebsockets.c
@@ -344,6 +344,20 @@ just_kill_connection:
 	lws_free_wsi(wsi);
 }
 
+#if LWS_POSIX
+LWS_VISIBLE int
+interface_to_sa(struct lws_context *context, const char *ifname, struct sockaddr_in *addr, size_t addrlen)
+{
+	int ipv6 = 0;
+#ifdef LWS_USE_IPV6
+	ipv6 = LWS_IPV6_ENABLED(context);
+#endif
+	(void)context;
+
+	return lws_interface_to_sa(ipv6, ifname, addr, addrlen);
+}
+#endif
+
 LWS_VISIBLE int
 lws_get_addresses(struct lws_context *context, void *ads, char *name,
 		  int name_len, char *rip, int rip_len)
diff --git a/lib/libwebsockets.h b/lib/libwebsockets.h
index 6daae786..b1debc1c 100644
--- a/lib/libwebsockets.h
+++ b/lib/libwebsockets.h
@@ -1378,6 +1378,9 @@ lws_service(struct lws_context *context, int timeout_ms);
 LWS_VISIBLE LWS_EXTERN void
 lws_cancel_service(struct lws_context *context);
 
+LWS_VISIBLE LWS_EXTERN int
+lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr, size_t addrlen);
+
 LWS_VISIBLE LWS_EXTERN const unsigned char *
 lws_token_to_string(enum lws_token_indexes token);
 
diff --git a/lib/lws-plat-unix.c b/lib/lws-plat-unix.c
index 3b82d919..a0e4f868 100644
--- a/lib/lws-plat-unix.c
+++ b/lib/lws-plat-unix.c
@@ -343,8 +343,7 @@ lws_plat_context_late_destroy(struct lws_context *context)
 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 
 LWS_VISIBLE int
-interface_to_sa(struct lws_context *context,
-		const char *ifname, struct sockaddr_in *addr, size_t addrlen)
+lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 {
 	int rc = -1;
 
@@ -367,7 +366,7 @@ interface_to_sa(struct lws_context *context,
 		switch (ifc->ifa_addr->sa_family) {
 		case AF_INET:
 #ifdef LWS_USE_IPV6
-			if (LWS_IPV6_ENABLED(context)) {
+			if (ipv6) {
 				/* map IPv4 to IPv6 */
 				bzero((char *)&addr6->sin6_addr,
 						sizeof(struct in6_addr));
diff --git a/lib/lws-plat-win.c b/lib/lws-plat-win.c
index 988460a4..7e793104 100644
--- a/lib/lws-plat-win.c
+++ b/lib/lws-plat-win.c
@@ -308,8 +308,8 @@ lws_plat_context_late_destroy(struct lws_context *context)
 	WSACleanup();
 }
 
-LWS_VISIBLE int
-interface_to_sa(struct lws_context *context,
+LWS_VISIBLE LWS_EXTERN int
+lws_interface_to_sa(int ipv6,
 		const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 {
 	long long address = inet_addr(ifname);