diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 6985ad870c..9190a7ee76 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -515,7 +515,7 @@ static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
             l += snprintf(p + l, size - l, "%s", d);
             g_free(d);
         } else {
-            l += snprintf(p + l, size - l, "%s", object_get_typename(OBJECT(dev)));
+            return l;
         }
     }
     l += snprintf(p + l , size - l, "/");
@@ -867,9 +867,17 @@ static void qbus_initfn(Object *obj)
     QTAILQ_INIT(&bus->children);
 }
 
+static char *default_bus_get_fw_dev_path(DeviceState *dev)
+{
+    return g_strdup(object_get_typename(OBJECT(dev)));
+}
+
 static void bus_class_init(ObjectClass *class, void *data)
 {
+    BusClass *bc = BUS_CLASS(class);
+
     class->unparent = bus_unparent;
+    bc->get_fw_dev_path = default_bus_get_fw_dev_path;
 }
 
 static void qbus_finalize(Object *obj)
diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
index ea2e11ae95..6849a018a9 100644
--- a/hw/virtio/virtio-bus.c
+++ b/hw/virtio/virtio-bus.c
@@ -161,10 +161,16 @@ static char *virtio_bus_get_dev_path(DeviceState *dev)
     return qdev_get_dev_path(proxy);
 }
 
+static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
+{
+    return NULL;
+}
+
 static void virtio_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *bus_class = BUS_CLASS(klass);
     bus_class->get_dev_path = virtio_bus_get_dev_path;
+    bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
 }
 
 static const TypeInfo virtio_bus_info = {