diff --git a/PDP11/pdp11_xq.c b/PDP11/pdp11_xq.c
index 5e7041a3..1e52089c 100644
--- a/PDP11/pdp11_xq.c
+++ b/PDP11/pdp11_xq.c
@@ -2901,10 +2901,6 @@ t_stat xq_attach(UNIT* uptr, CONST char* cptr)
     xq->var->must_poll = (SCPE_OK != eth_clr_async(xq->var->etherface));
   }
   if (SCPE_OK != eth_check_address_conflict (xq->var->etherface, &xq->var->mac)) {
-    char buf[32];
-
-    eth_mac_fmt(&xq->var->mac, buf);     /* format ethernet mac address */
-    sim_printf("%s: MAC Address Conflict on LAN for address %s, change the MAC address to a unique value\n", xq->dev->name, buf);
     eth_close(xq->var->etherface);
     free(tptr);
     free(xq->var->etherface);
diff --git a/PDP11/pdp11_xu.c b/PDP11/pdp11_xu.c
index f86d6380..a05d36d5 100644
--- a/PDP11/pdp11_xu.c
+++ b/PDP11/pdp11_xu.c
@@ -1776,10 +1776,6 @@ t_stat xu_attach(UNIT* uptr, CONST char* cptr)
   }
   eth_set_throttle (xu->var->etherface, xu->var->throttle_time, xu->var->throttle_burst, xu->var->throttle_delay);
   if (SCPE_OK != eth_check_address_conflict (xu->var->etherface, &xu->var->mac)) {
-    char buf[32];
-
-    eth_mac_fmt(&xu->var->mac, buf);     /* format ethernet mac address */
-    sim_printf("%s: MAC Address Conflict on LAN for address %s\n", xu->dev->name, buf);
     eth_close(xu->var->etherface);
     free(tptr);
     free(xu->var->etherface);