diff --git a/hw/usb-bus.c b/hw/usb-bus.c
index 03933f1..2cac1e8 100644
--- a/hw/usb-bus.c
+++ b/hw/usb-bus.c
@@ -14,16 +14,13 @@
 static int next_usb_bus = 0;
 static QTAILQ_HEAD(, USBBus) busses = QTAILQ_HEAD_INITIALIZER(busses);
 
-USBBus *usb_bus_new(DeviceState *host)
+void usb_bus_new(USBBus *bus, DeviceState *host)
 {
-    USBBus *bus;
-
-    bus = FROM_QBUS(USBBus, qbus_create(&usb_bus_info, host, NULL));
+    qbus_create_inplace(&bus->qbus, &usb_bus_info, host, NULL);
     bus->busnr = next_usb_bus++;
     QTAILQ_INIT(&bus->free);
     QTAILQ_INIT(&bus->used);
     QTAILQ_INSERT_TAIL(&busses, bus, next);
-    return bus;
 }
 
 USBBus *usb_bus_find(int busnr)
diff --git a/hw/usb-musb.c b/hw/usb-musb.c
index 9eb0d63..09ec5a1 100644
--- a/hw/usb-musb.c
+++ b/hw/usb-musb.c
@@ -281,7 +281,7 @@
 
 struct MUSBState {
     qemu_irq *irqs;
-    USBBus *bus;
+    USBBus bus;
     USBPort port;
 
     int idx;
@@ -331,8 +331,8 @@
         s->ep[i].epnum = i;
     }
 
-    s->bus = usb_bus_new(NULL /* FIXME */);
-    usb_register_port(s->bus, &s->port, s, 0, musb_attach);
+    usb_bus_new(&s->bus, NULL /* FIXME */);
+    usb_register_port(&s->bus, &s->port, s, 0, musb_attach);
 
     return s;
 }
diff --git a/hw/usb-ohci.c b/hw/usb-ohci.c
index 6e428c4..48ccd49 100644
--- a/hw/usb-ohci.c
+++ b/hw/usb-ohci.c
@@ -65,7 +65,7 @@
 };
 
 typedef struct {
-    USBBus *bus;
+    USBBus bus;
     qemu_irq irq;
     enum ohci_type type;
     int mem;
@@ -1690,10 +1690,10 @@
     ohci->irq = irq;
     ohci->type = type;
 
-    ohci->bus = usb_bus_new(dev);
+    usb_bus_new(&ohci->bus, dev);
     ohci->num_ports = num_ports;
     for (i = 0; i < num_ports; i++) {
-        usb_register_port(ohci->bus, &ohci->rhport[i].port, ohci, i, ohci_attach);
+        usb_register_port(&ohci->bus, &ohci->rhport[i].port, ohci, i, ohci_attach);
     }
 
     ohci->async_td = 0;
diff --git a/hw/usb-uhci.c b/hw/usb-uhci.c
index 6807413..a3ed9b2 100644
--- a/hw/usb-uhci.c
+++ b/hw/usb-uhci.c
@@ -122,7 +122,7 @@
 
 typedef struct UHCIState {
     PCIDevice dev;
-    USBBus *bus;
+    USBBus bus;
     uint16_t cmd; /* cmd register */
     uint16_t status;
     uint16_t intr; /* interrupt enable register */
@@ -1083,9 +1083,9 @@
     pci_conf[0x3d] = 4; // interrupt pin 3
     pci_conf[0x60] = 0x10; // release number
 
-    s->bus = usb_bus_new(&s->dev.qdev);
+    usb_bus_new(&s->bus, &s->dev.qdev);
     for(i = 0; i < NB_PORTS; i++) {
-        usb_register_port(s->bus, &s->ports[i].port, s, i, uhci_attach);
+        usb_register_port(&s->bus, &s->ports[i].port, s, i, uhci_attach);
     }
     s->frame_timer = qemu_new_timer(vm_clock, uhci_frame_timer, s);
 
diff --git a/hw/usb.h b/hw/usb.h
index 7c5cf83..467cddb 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -303,7 +303,7 @@
     QTAILQ_ENTRY(USBBus) next;
 };
 
-USBBus *usb_bus_new(DeviceState *host);
+void usb_bus_new(USBBus *bus, DeviceState *host);
 USBBus *usb_bus_find(int busnr);
 void usb_qdev_register(USBDeviceInfo *info);
 void usb_qdev_register_many(USBDeviceInfo *info);