diff --git a/src/tests/ipv4_test.c b/src/tests/ipv4_test.c
index be2760027..815f70ebd 100644
--- a/src/tests/ipv4_test.c
+++ b/src/tests/ipv4_test.c
@@ -186,36 +186,36 @@ static void ipv4_route_okx ( const char *dest, struct testnet *scope,
 			 __FILE__, __LINE__ )
 
 /** net0: Single address and gateway (DHCP assignment) */
-TESTNET ( net0,
+TESTNET ( net0, "52:54:00:59:ba:c9",
 	  { "dhcp/ip", "192.168.0.1" },
 	  { "dhcp/netmask", "255.255.255.0" },
 	  { "dhcp/gateway", "192.168.0.254" } );
 
 /** net1: Single address and gateway (DHCP assignment) */
-TESTNET ( net1,
+TESTNET ( net1, "52:54:00:1a:db:95",
 	  { "dhcp/ip", "192.168.0.2" },
 	  { "dhcp/netmask", "255.255.255.0" },
 	  { "dhcp/gateway", "192.168.0.254" } );
 
 /** net2: Small /31 subnet mask */
-TESTNET ( net2,
+TESTNET ( net2, "52:54:00:f9:ee:21",
 	  { "ip", "10.31.31.0" },
 	  { "netmask", "255.255.255.254" },
 	  { "gateway", "10.31.31.1" } );
 
 /** net3: Small /32 subnet mask */
-TESTNET ( net3,
+TESTNET ( net3, "52:54:00:4a:88:ec",
 	  { "ip", "10.32.32.32" },
 	  { "netmask", "255.255.255.255" },
 	  { "gateway", "192.168.32.254" } );
 
 /** net4: Local subnet with no gateway */
-TESTNET ( net4,
+TESTNET ( net4, "52:54:00:68:ad:cd",
 	  { "ip", "192.168.86.1" },
 	  { "netmask", "255.255.240.0" } );
 
 /** net5: Static routes */
-TESTNET ( net5,
+TESTNET ( net5, "52:54:00:b0:d5:07",
 	  { "ip", "10.42.0.1" },
 	  { "netmask", "255.255.0.0" },
 	  { "gateway", "10.42.0.254" /* should be ignored */ },
diff --git a/src/tests/netdev_test.c b/src/tests/netdev_test.c
index 388a5af88..f31c94934 100644
--- a/src/tests/netdev_test.c
+++ b/src/tests/netdev_test.c
@@ -36,6 +36,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #include <stdio.h>
 #include <ipxe/netdevice.h>
 #include <ipxe/ethernet.h>
+#include <ipxe/if_ether.h>
+#include <ipxe/base16.h>
 #include <ipxe/test.h>
 #include "netdev_test.h"
 
@@ -113,6 +115,8 @@ void testnet_okx ( struct testnet *testnet, const char *file,
 	testnet->netdev->dev = &testnet->dev;
 	snprintf ( testnet->netdev->name, sizeof ( testnet->netdev->name ),
 		   "%s", testnet->dev.name );
+	okx ( hex_decode ( ':', testnet->hwaddr, testnet->netdev->hw_addr,
+			   ETH_ALEN ) == ETH_ALEN, file, line );
 
 	/* Register device */
 	okx ( register_netdev ( testnet->netdev ) == 0, file, line );
diff --git a/src/tests/netdev_test.h b/src/tests/netdev_test.h
index ddb8c9b11..d86acf424 100644
--- a/src/tests/netdev_test.h
+++ b/src/tests/netdev_test.h
@@ -26,6 +26,8 @@ struct testnet {
 	struct net_device *netdev;
 	/** Dummy physical device */
 	struct device dev;
+	/** MAC address */
+	const char *hwaddr;
 	/** Initial settings */
 	struct testnet_setting *testset;
 	/** Number of initial settings */
@@ -36,9 +38,10 @@ struct testnet {
  * Declare a test network device
  *
  * @v NAME		Network device name
+ * @v HWADDR		MAC address
  * @v ...		Initial network device settings
  */
-#define TESTNET( NAME, ... )						\
+#define TESTNET( NAME, HWADDR, ... )					\
 	static struct testnet_setting NAME ## _setting[] = {		\
 		__VA_ARGS__						\
 	};								\
@@ -51,6 +54,7 @@ struct testnet {
 			.children =					\
 				LIST_HEAD_INIT ( NAME.dev.children ),	\
 		},							\
+		.hwaddr= HWADDR,					\
 		.testset = NAME ## _setting,				\
 		.count = ( sizeof ( NAME ## _setting ) /		\
 			   sizeof ( NAME ## _setting[0] ) ),		\