diff --git a/src/openvpn/socket.c b/src/openvpn/socket.c
index 24d12768289..555cb67420e 100644
--- a/src/openvpn/socket.c
+++ b/src/openvpn/socket.c
@@ -3481,7 +3481,7 @@ link_socket_write_udp_posix_sendmsg(struct link_socket *sock,
             cmsg->cmsg_type = IPV6_PKTINFO;
 
             pkti6 = (struct in6_pktinfo *) CMSG_DATA(cmsg);
-            pkti6->ipi6_ifindex = to->pi.in6.ipi6_ifindex;
+            pkti6->ipi6_ifindex = 0;
             pkti6->ipi6_addr = to->pi.in6.ipi6_addr;
             break;
         }