diff --git a/source/enet/peer.c b/source/enet/peer.c
index c7a7267a..3334035d 100755
--- a/source/enet/peer.c
+++ b/source/enet/peer.c
@@ -116,7 +116,7 @@ enet_peer_send (ENetPeer * peer, enet_uint8 channelID, ENetPacket * packet)
              fragmentNumber,
              fragmentOffset;
 
-      packet -> flags = ENET_PACKET_FLAG_RELIABLE;
+      packet -> flags |= ENET_PACKET_FLAG_RELIABLE;
 
       for (fragmentNumber = 0,
              fragmentOffset = 0;