diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 519e8a5ccb..812ddfd679 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -226,7 +226,7 @@ static QEMUMachine pc_machine_v0_12 = {
     .compat_props = (GlobalProperty[]) {
         {
             .driver   = "virtio-serial-pci",
-            .property = "max_nr_ports",
+            .property = "max_ports",
             .value    = stringify(1),
         },{
             .driver   = "virtio-serial-pci",
@@ -249,7 +249,7 @@ static QEMUMachine pc_machine_v0_11 = {
             .value    = stringify(0),
         },{
             .driver   = "virtio-serial-pci",
-            .property = "max_nr_ports",
+            .property = "max_ports",
             .value    = stringify(1),
         },{
             .driver   = "virtio-serial-pci",
@@ -288,7 +288,7 @@ static QEMUMachine pc_machine_v0_10 = {
             .value    = stringify(PCI_CLASS_DISPLAY_OTHER),
         },{
             .driver   = "virtio-serial-pci",
-            .property = "max_nr_ports",
+            .property = "max_ports",
             .value    = stringify(1),
         },{
             .driver   = "virtio-serial-pci",
diff --git a/hw/ppc440_bamboo.c b/hw/ppc440_bamboo.c
index 6ca873ee7e..d471d5df77 100644
--- a/hw/ppc440_bamboo.c
+++ b/hw/ppc440_bamboo.c
@@ -186,7 +186,7 @@ static QEMUMachine bamboo_machine_v0_12 = {
     .compat_props = (GlobalProperty[]) {
         {
             .driver   = "virtio-serial-pci",
-            .property = "max_nr_ports",
+            .property = "max_ports",
             .value    = stringify(1),
         },{
             .driver   = "virtio-serial-pci",