diff --git a/implementation/endpoints/include/udp_server_endpoint_impl_receive_op.hpp b/implementation/endpoints/include/udp_server_endpoint_impl_receive_op.hpp
index ad5564321..059dc3cf0 100644
--- a/implementation/endpoints/include/udp_server_endpoint_impl_receive_op.hpp
+++ b/implementation/endpoints/include/udp_server_endpoint_impl_receive_op.hpp
@@ -309,7 +309,7 @@ receive_cb (std::shared_ptr<storage> _data) {
                          cmsg != NULL;
                          cmsg = CMSG_NXTHDR(&its_header, cmsg)) {
 
-#if defined(IP_PKTINFO)
+#if defined(IP_PKTINFO) # Linux, QNX io-pkt
                         struct in_pktinfo *its_pktinfo_v4;
                         if (cmsg->cmsg_level == IPPROTO_IP
                             && cmsg->cmsg_type == IP_PKTINFO
@@ -322,7 +322,7 @@ receive_cb (std::shared_ptr<storage> _data) {
                                 break;
                             }
                         }
-#elif defined(IP_RECVDSTADDR)
+#elif defined(IP_RECVDSTADDR) # FreeBSD, QNX io-sock
                         struct in_addr *its_pktinfo_v4;
                         if (cmsg->cmsg_level == IPPROTO_IP
                             && cmsg->cmsg_type == IP_RECVDSTADDR
diff --git a/implementation/endpoints/src/udp_server_endpoint_impl.cpp b/implementation/endpoints/src/udp_server_endpoint_impl.cpp
index 35940a7c4..cf6a60616 100644
--- a/implementation/endpoints/src/udp_server_endpoint_impl.cpp
+++ b/implementation/endpoints/src/udp_server_endpoint_impl.cpp
@@ -801,9 +801,9 @@ udp_server_endpoint_impl::set_multicast_option(const boost::asio::ip::address& _
 		int its_pktinfo_option(1);
 		::setsockopt(multicast_socket_->native_handle(),
 				(is_v4_ ? IPPROTO_IP : IPPROTO_IPV6),
-#if defined(IP_PKTINFO)
+#if defined(IP_PKTINFO) # Linux, QNX io-pkt
 				(is_v4_ ? IP_PKTINFO : IPV6_RECVPKTINFO),
-#elif defined(IP_RECVDSTADDR)
+#elif defined(IP_RECVDSTADDR) # FreeBSD, QNX io-sock
                 (is_v4_ ? IP_RECVDSTADDR : IPV6_RECVPKTINFO),
 #else
                 #error "Platform not supported. Neither IP_PKTINFO nor IP_RECVDSTADDR is defined.";