diff --git a/engine/server/sv_init.c b/engine/server/sv_init.c
index b8a5ec87b..efced3db6 100644
--- a/engine/server/sv_init.c
+++ b/engine/server/sv_init.c
@@ -748,7 +748,8 @@ void SV_SetupNetworkBuffers(qboolean bigcoords)
 
 		//make sure those are kept up to date too.
 		svs.clients[i].datagram.prim =
-		svs.clients[i].netchan.message.prim = svs.clients[i].netchan.netprim;
+		svs.clients[i].netchan.message.prim =
+		svs.clients[i].backbuf.prim = svs.clients[i].netchan.netprim;
 	}
 
 	//
diff --git a/engine/server/sv_main.c b/engine/server/sv_main.c
index a26b0040d..1eeafefa6 100644
--- a/engine/server/sv_main.c
+++ b/engine/server/sv_main.c
@@ -2362,6 +2362,7 @@ client_t *SV_AddSplit(client_t *controller, char *info, int id)
 	cl->spectator = asspec;
 	cl->netchan.remote_address = controller->netchan.remote_address;
 	cl->netchan.message.prim = controller->netchan.message.prim;
+	cl->backbuf.prim = controller->backbuf.prim;
 	cl->netchan.netprim = controller->netchan.netprim;
 	cl->zquake_extensions = controller->zquake_extensions;
 	cl->fteprotocolextensions = controller->fteprotocolextensions;
@@ -2968,8 +2969,9 @@ void SV_DoDirectConnect(svconnectinfo_t *fte_restrict info)
 	else
 		newcl->datagram.maxsize = MAX_DATAGRAM;
 
-	newcl->netchan.netprim = svs.netprim;
-	newcl->datagram.prim = svs.netprim;
+	newcl->netchan.netprim =
+	newcl->datagram.prim =
+	newcl->backbuf.prim =
 	newcl->netchan.message.prim = svs.netprim;
 
 	SV_ClientProtocolExtensionsChanged(newcl);
diff --git a/engine/server/sv_nchan.c b/engine/server/sv_nchan.c
index cb15153bf..437652b64 100644
--- a/engine/server/sv_nchan.c
+++ b/engine/server/sv_nchan.c
@@ -33,6 +33,7 @@ void ClientReliableCheckBlock(client_t *cl, int maxsize)
 		if (!cl->num_backbuf)
 		{
 			memset(&cl->backbuf, 0, sizeof(cl->backbuf));
+			cl->backbuf.prim = cl->netchan.message.prim;
 			cl->backbuf.allowoverflow = true;
 			cl->backbuf.data = cl->backbuf_data[0];
 			cl->backbuf.maxsize = min(cl->netchan.message.maxsize, sizeof(cl->backbuf_data[0]));
@@ -52,6 +53,7 @@ void ClientReliableCheckBlock(client_t *cl, int maxsize)
 				return;
 			}
 			memset(&cl->backbuf, 0, sizeof(cl->backbuf));
+			cl->backbuf.prim = cl->netchan.message.prim;
 			cl->backbuf.allowoverflow = true;
 			cl->backbuf.data = cl->backbuf_data[cl->num_backbuf];
 			cl->backbuf.maxsize = min(cl->netchan.message.maxsize, sizeof(cl->backbuf_data[cl->num_backbuf]));
diff --git a/engine/server/sv_send.c b/engine/server/sv_send.c
index 30c3feb63..1fd21a38d 100644
--- a/engine/server/sv_send.c
+++ b/engine/server/sv_send.c
@@ -3607,6 +3607,7 @@ void SV_SendClientMessages (void)
 				if (c->num_backbuf)
 				{
 					memset(&c->backbuf, 0, sizeof(c->backbuf));
+					c->backbuf.prim = c->netchan.message.prim;
 					c->backbuf.data = c->backbuf_data[c->num_backbuf - 1];
 					c->backbuf.cursize = c->backbuf_size[c->num_backbuf - 1];
 					c->backbuf.maxsize = min(c->netchan.message.maxsize, sizeof(c->backbuf_data[c->num_backbuf-1]));