diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
index 3c8e53b..7ac36ad 100644
--- a/hw/core/sysbus.c
+++ b/hw/core/sysbus.c
@@ -293,16 +293,8 @@
 {
     SysBusDevice *s = SYS_BUS_DEVICE(dev);
     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(s);
-    /* for the explicit unit address fallback case: */
     char *addr, *fw_dev_path;
 
-    if (s->num_mmio) {
-        return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
-                               s->mmio[0].addr);
-    }
-    if (s->num_pio) {
-        return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
-    }
     if (sbc->explicit_ofw_unit_address) {
         addr = sbc->explicit_ofw_unit_address(s);
         if (addr) {
@@ -311,6 +303,13 @@
             return fw_dev_path;
         }
     }
+    if (s->num_mmio) {
+        return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
+                               s->mmio[0].addr);
+    }
+    if (s->num_pio) {
+        return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
+    }
     return g_strdup(qdev_fw_name(dev));
 }