diff --git a/src/core/ipv4/ip4.c b/src/core/ipv4/ip4.c
index 863df55da..ec519755d 100644
--- a/src/core/ipv4/ip4.c
+++ b/src/core/ipv4/ip4.c
@@ -1057,6 +1057,14 @@ ip4_output_if_opt_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *d
   LWIP_DEBUGF(IP_DEBUG, ("ip4_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], (u16_t)netif->num));
   ip4_debug_print(p);
 
+#ifdef LWIP_HOOK_IP4_OUTPUT
+  err_t err = ERR_OK;
+  if ((err = LWIP_HOOK_IP4_OUTPUT(p, src, dest, ttl, tos, proto, netif, ip_options, optlen)) != ERR_OK)
+  {
+    return err;
+  }
+#endif
+
 #if ENABLE_LOOPBACK
 #if ESP_LWIP && IP_NAPT
   /* doesn't work for external wifi interfaces */
diff --git a/src/core/ipv6/ip6.c b/src/core/ipv6/ip6.c
index b1df7cfc3..253298933 100644
--- a/src/core/ipv6/ip6.c
+++ b/src/core/ipv6/ip6.c
@@ -1243,6 +1243,14 @@ ip6_output_if_src(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest,
   LWIP_DEBUGF(IP6_DEBUG, ("ip6_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], (u16_t)netif->num));
   ip6_debug_print(p);
 
+#ifdef LWIP_HOOK_IP6_OUTPUT
+  err_t err = ERR_OK;
+  if ((err = LWIP_HOOK_IP6_OUTPUT(p, src, dest, hl, tc, nexth, netif)) != ERR_OK)
+  {
+    return err;
+  }
+#endif
+
 #if ENABLE_LOOPBACK
   {
     int i;