diff --git a/common/main/net_udp.h b/common/main/net_udp.h
index 024ebb1a1..dbcef5112 100644
--- a/common/main/net_udp.h
+++ b/common/main/net_udp.h
@@ -136,14 +136,14 @@ struct UDP_frame_info : prohibit_void_ptr<UDP_frame_info>
 };
 
 // packet structure for multi-buffer
-struct UDP_mdata_info
+struct UDP_mdata_info : prohibit_void_ptr<UDP_mdata_info>
 {
 	ubyte				type;
 	ubyte				Player_num;
 	uint32_t			pkt_num;
 	ushort				mbuf_size;
 	ubyte				mbuf[UPID_MDATA_BUF_SIZE];
-} __pack__;
+};
 
 // structure to store MDATA to maybe resend
 struct UDP_mdata_store
diff --git a/similar/main/net_udp.cpp b/similar/main/net_udp.cpp
index c7c79401a..b47624e12 100644
--- a/similar/main/net_udp.cpp
+++ b/similar/main/net_udp.cpp
@@ -1073,7 +1073,7 @@ void net_udp_init()
 
 	Netgame = {};
 	UDP_Seq = {};
-	memset(&UDP_MData, 0, sizeof(UDP_mdata_info));
+	UDP_MData = {};
 	net_udp_noloss_init_mdata_queue();
 	UDP_Seq.type = UPID_REQUEST;
 	memcpy(UDP_Seq.player.callsign, Players[Player_num].callsign, CALLSIGN_LEN+1);
@@ -3932,7 +3932,7 @@ net_udp_level_sync(void)
 {
 	int result = 0;
 
-	memset(&UDP_MData, 0, sizeof(UDP_mdata_info));
+	UDP_MData = {};
 	net_udp_noloss_init_mdata_queue();
 
 	net_udp_flush(); // Flush any old packets