diff --git a/hw/e1000.c b/hw/e1000.c
index 34cc451cf73b29ec11f099484d8e0219751e2894..96d045d20996ec4aaf5792aa74f3480c406d4ade 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -544,8 +544,8 @@ start_xmit(E1000State *s)
 static int
 receive_filter(E1000State *s, const uint8_t *buf, int size)
 {
-    static uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
-    static int mta_shift[] = {4, 3, 2, 0};
+    static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+    static const int mta_shift[] = {4, 3, 2, 0};
     uint32_t f, rctl = s->mac_reg[RCTL], ra[2], *rp;
 
     if (is_vlan_packet(s, buf) && vlan_rx_filter_enabled(s)) {