diff --git a/hw/arm/mps2-tz.c b/hw/arm/mps2-tz.c
index f40e854dec..e287ad4d06 100644
--- a/hw/arm/mps2-tz.c
+++ b/hw/arm/mps2-tz.c
@@ -1078,6 +1078,10 @@ static void mps2tz_common_init(MachineState *machine)
                 { "gpio1", make_unimp_dev, &mms->gpio[1], 0x41101000, 0x1000 },
                 { "gpio2", make_unimp_dev, &mms->gpio[2], 0x41102000, 0x1000 },
                 { "gpio3", make_unimp_dev, &mms->gpio[3], 0x41103000, 0x1000 },
+                { /* port 4 USER AHB interface 0 */ },
+                { /* port 5 USER AHB interface 1 */ },
+                { /* port 6 USER AHB interface 2 */ },
+                { /* port 7 USER AHB interface 3 */ },
                 { "eth-usb", make_eth_usb, NULL, 0x41400000, 0x200000, { 49 } },
             },
         },