diff --git a/src/drivers/net/ecm.c b/src/drivers/net/ecm.c
index f531b04f8..826b3b16d 100644
--- a/src/drivers/net/ecm.c
+++ b/src/drivers/net/ecm.c
@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #include <ipxe/if_ether.h>
 #include <ipxe/base16.h>
 #include <ipxe/profile.h>
+#include <ipxe/acpimac.h>
 #include <ipxe/usb.h>
 #include "ecm.h"
 
@@ -93,6 +94,14 @@ int ecm_fetch_mac ( struct usb_function *func,
 	int len;
 	int rc;
 
+	/* Use system-specific MAC address, if present and not already used */
+	if ( ( ( rc = acpi_mac ( hw_addr ) ) == 0 ) &&
+	     ! find_netdev_by_ll_addr ( &ethernet_protocol, hw_addr ) ) {
+		DBGC ( usb, "USB %s using system-specific MAC %s\n",
+		       func->name, eth_ntoa ( hw_addr ) );
+		return 0;
+	}
+
 	/* Fetch MAC address string */
 	len = usb_get_string_descriptor ( usb, desc->mac, 0, buf,
 					  sizeof ( buf ) );