diff --git a/hw/arm/sbsa-ref.c b/hw/arm/sbsa-ref.c
index 64e1cbce17..bc89eb4806 100644
--- a/hw/arm/sbsa-ref.c
+++ b/hw/arm/sbsa-ref.c
@@ -611,6 +611,7 @@ static void create_xhci(const SBSAMachineState *sms)
     hwaddr base = sbsa_ref_memmap[SBSA_XHCI].base;
     int irq = sbsa_ref_irqmap[SBSA_XHCI];
     DeviceState *dev = qdev_new(TYPE_XHCI_SYSBUS);
+    qdev_prop_set_uint32(dev, "slots", XHCI_MAXSLOTS);
 
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);