diff --git a/hw/xen_nic.c b/hw/xen_nic.c
index 5fcc7019044f23cbde1faf581c69695615466fac..4206132aea537f7bc84d4d065d74ced381aa3632 100644
--- a/hw/xen_nic.c
+++ b/hw/xen_nic.c
@@ -176,7 +176,7 @@ static void net_tx_packets(struct XenNetDev *netdev)
 	    if (txreq.flags & NETTXF_csum_blank) {
                 /* have read-only mapping -> can't fill checksum in-place */
                 if (!tmpbuf)
-                    tmpbuf = qemu_malloc(PAGE_SIZE);
+                    tmpbuf = qemu_malloc(XC_PAGE_SIZE);
                 memcpy(tmpbuf, page + txreq.offset, txreq.size);
 		net_checksum_calculate(tmpbuf, txreq.size);
                 qemu_send_packet(netdev->vs, tmpbuf, txreq.size);