diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index ef4b586..b2f7931 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1664,6 +1664,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
     pcmc->get_hotplug_handler = mc->get_hotplug_handler;
     pcmc->pci_enabled = true;
     pcmc->kvmclock_enabled = true;
+    pcmc->smbios_defaults = true;
     mc->get_hotplug_handler = pc_get_hotpug_handler;
     mc->default_boot_order = "cad";
     mc->hot_add_cpu = pc_hot_add_cpu;
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 22388c1..cc7a249 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -61,7 +61,6 @@ static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
 
 static bool has_pci_info;
 static bool has_acpi_build = true;
-static bool smbios_defaults = true;
 /* Make sure that guest addresses aligned at 1Gbyte boundaries get mapped to
  * host addresses aligned at 1Gbyte boundaries.  This way we can use 1GByte
  * pages in the host.
@@ -167,9 +166,8 @@ static void pc_init1(MachineState *machine)
     guest_info->isapc_ram_fw = !pci_enabled;
     guest_info->has_reserved_memory = has_reserved_memory;
 
-    if (smbios_defaults) {
+    if (pcmc->smbios_defaults) {
         MachineClass *mc = MACHINE_GET_CLASS(machine);
-        PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(mc);
         /* These values are guest ABI, do not change */
         smbios_set_defaults("QEMU", "Standard PC (i440FX + PIIX, 1996)",
                             mc->name, pcmc->smbios_legacy_mode);
@@ -303,7 +301,6 @@ static void pc_compat_2_0(MachineState *machine)
 static void pc_compat_1_7(MachineState *machine)
 {
     pc_compat_2_0(machine);
-    smbios_defaults = false;
     gigabyte_align = false;
     option_rom_has_mr = true;
     x86_cpu_compat_disable_kvm_features(FEAT_1_ECX, CPUID_EXT_X2APIC);
@@ -402,7 +399,6 @@ static void pc_init_isa(MachineState *machine)
 {
     has_pci_info = false;
     has_acpi_build = false;
-    smbios_defaults = false;
     gigabyte_align = false;
     has_reserved_memory = false;
     option_rom_has_mr = true;
@@ -487,6 +483,7 @@ static const TypeInfo pc_i440fx_machine_v2_0_type_info = {
 static void pc_i440fx_machine_v1_7_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    PCMachineClass *pcmc = PC_MACHINE_CLASS(oc);
     static GlobalProperty compat_props[] = {
         PC_COMPAT_1_7,
         { /* end of list */ }
@@ -496,6 +493,7 @@ static void pc_i440fx_machine_v1_7_class_init(ObjectClass *oc, void *data)
     mc->init = pc_init_pci_1_7;
     mc->name = "pc-i440fx-1.7";
     machine_class_add_compat_props(mc, compat_props);
+    pcmc->smbios_defaults = false;
 }
 
 static const TypeInfo pc_i440fx_machine_v1_7_type_info = {
@@ -973,6 +971,7 @@ static void isapc_machine_class_init(ObjectClass *oc, void *data)
     mc->hot_add_cpu = NULL;
     mc->name = "isapc";
     machine_class_add_compat_props(mc, compat_props);
+    pcmc->smbios_defaults = false;
 }
 
 static const TypeInfo isapc_machine_type_info = {
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index ad4ff5a..5ff83d7 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -51,7 +51,6 @@
 
 static bool has_pci_info;
 static bool has_acpi_build = true;
-static bool smbios_defaults = true;
 /* Make sure that guest addresses aligned at 1Gbyte boundaries get mapped to
  * host addresses aligned at 1Gbyte boundaries.  This way we can use 1GByte
  * pages in the host.
@@ -155,9 +154,8 @@ static void pc_q35_init(MachineState *machine)
     guest_info->has_acpi_build = has_acpi_build;
     guest_info->has_reserved_memory = has_reserved_memory;
 
-    if (smbios_defaults) {
+    if (pcmc->smbios_defaults) {
         MachineClass *mc = MACHINE_GET_CLASS(machine);
-        PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(machine);
         /* These values are guest ABI, do not change */
         smbios_set_defaults("QEMU", "Standard PC (Q35 + ICH9, 2009)",
                             mc->name, pcmc->smbios_legacy_mode);
@@ -282,7 +280,6 @@ static void pc_compat_2_0(MachineState *machine)
 static void pc_compat_1_7(MachineState *machine)
 {
     pc_compat_2_0(machine);
-    smbios_defaults = false;
     gigabyte_align = false;
     option_rom_has_mr = true;
     x86_cpu_compat_disable_kvm_features(FEAT_1_ECX, CPUID_EXT_X2APIC);
@@ -396,6 +393,7 @@ static TypeInfo pc_q35_machine_v2_0_type_info = {
 static void pc_q35_machine_v1_7_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    PCMachineClass *pcmc = PC_MACHINE_CLASS(oc);
     static GlobalProperty compat_props[] = {
         PC_COMPAT_1_7,
         { /* end of list */ }
@@ -405,6 +403,7 @@ static void pc_q35_machine_v1_7_class_init(ObjectClass *oc, void *data)
     mc->init = pc_q35_init_1_7;
     machine_class_add_compat_props(mc, compat_props);
     mc->name = "pc-q35-1.7";
+    pcmc->smbios_defaults = false;
 }
 
 static TypeInfo pc_q35_machine_v1_7_type_info = {
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 65ba51e..be60e30 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -56,6 +56,7 @@ struct PCMachineClass {
     bool pci_enabled;
     bool kvmclock_enabled;
     bool smbios_legacy_mode;
+    bool smbios_defaults;
 };
 
 typedef struct PCMachineState PCMachineState;
