diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 6a75718fbb..a7aad4b022 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -522,6 +522,10 @@ static QEMUMachine pc_machine_v0_12 = {
             .driver   = "virtio-blk-pci",\
             .property = "vectors",\
             .value    = stringify(0),\
+        },{\
+            .driver   = "PCI",\
+            .property = "rombar",\
+            .value    = stringify(0),\
         }
 
 static QEMUMachine pc_machine_v0_11 = {