diff --git a/src/engine/server/server.cpp b/src/engine/server/server.cpp
index 1a2db2570..f40080995 100644
--- a/src/engine/server/server.cpp
+++ b/src/engine/server/server.cpp
@@ -1024,7 +1024,7 @@ void CServer::ProcessClientPacket(CNetChunk *pPacket)
 			Msg.AddInt(Chunk);
 			Msg.AddInt(ChunkSize);
 			Msg.AddRaw(&m_pCurrentMapData[Offset], ChunkSize);
-			SendMsgEx(&Msg, MSGFLAG_FLUSH, ClientID, true);
+			SendMsgEx(&Msg, MSGFLAG_VITAL|MSGFLAG_FLUSH, ClientID, true);
 
 			if(g_Config.m_Debug)
 			{
@@ -1445,7 +1445,7 @@ void CServer::PumpNetwork()
 			Msg.AddInt(Chunk);
 			Msg.AddInt(ChunkSize);
 			Msg.AddRaw(&m_pCurrentMapData[Offset], ChunkSize);
-			SendMsgEx(&Msg, MSGFLAG_FLUSH, i, true);
+			SendMsgEx(&Msg, MSGFLAG_VITAL|MSGFLAG_FLUSH, i, true);
 
 			if(g_Config.m_Debug)
 			{