diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index 80acf227..c8ae4e34 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -1875,7 +1875,7 @@ tcp_output_control_segment(const struct tcp_pcb *pcb, struct pbuf *p,
     }
 #endif
     if (pcb != NULL) {
-      NETIF_SET_HINTS(netif, &(pcb->netif_hints));
+      NETIF_SET_HINTS(netif, LWIP_CONST_CAST(struct netif_hint*, &(pcb->netif_hints)));
       ttl = pcb->ttl;
       tos = pcb->tos;
     } else {