diff --git a/include/hw/acpi/acpi_dev_interface.h b/include/hw/acpi/acpi_dev_interface.h
index dabf4c4fc9..43ff119179 100644
--- a/include/hw/acpi/acpi_dev_interface.h
+++ b/include/hw/acpi/acpi_dev_interface.h
@@ -25,11 +25,7 @@ typedef enum {
      INTERFACE_CHECK(AcpiDeviceIf, (obj), \
                      TYPE_ACPI_DEVICE_IF)
 
-
-typedef struct AcpiDeviceIf {
-    /* <private> */
-    Object Parent;
-} AcpiDeviceIf;
+typedef struct AcpiDeviceIf AcpiDeviceIf;
 
 void acpi_send_event(DeviceState *dev, AcpiEventStatusBits event);
 
diff --git a/include/hw/arm/linux-boot-if.h b/include/hw/arm/linux-boot-if.h
index aba4479a14..7bbdfd1cc6 100644
--- a/include/hw/arm/linux-boot-if.h
+++ b/include/hw/arm/linux-boot-if.h
@@ -16,10 +16,7 @@
 #define ARM_LINUX_BOOT_IF(obj) \
     INTERFACE_CHECK(ARMLinuxBootIf, (obj), TYPE_ARM_LINUX_BOOT_IF)
 
-typedef struct ARMLinuxBootIf {
-    /*< private >*/
-    Object parent_obj;
-} ARMLinuxBootIf;
+typedef struct ARMLinuxBootIf ARMLinuxBootIf;
 
 typedef struct ARMLinuxBootIfClass {
     /*< private >*/
diff --git a/include/hw/fw-path-provider.h b/include/hw/fw-path-provider.h
index 050cb05d92..5df893a3d8 100644
--- a/include/hw/fw-path-provider.h
+++ b/include/hw/fw-path-provider.h
@@ -30,9 +30,7 @@
 #define FW_PATH_PROVIDER(obj) \
      INTERFACE_CHECK(FWPathProvider, (obj), TYPE_FW_PATH_PROVIDER)
 
-typedef struct FWPathProvider {
-    Object parent_obj;
-} FWPathProvider;
+typedef struct FWPathProvider FWPathProvider;
 
 typedef struct FWPathProviderClass {
     InterfaceClass parent_class;
diff --git a/include/hw/hotplug.h b/include/hw/hotplug.h
index 1a0516a479..6321e292fd 100644
--- a/include/hw/hotplug.h
+++ b/include/hw/hotplug.h
@@ -23,11 +23,7 @@
 #define HOTPLUG_HANDLER(obj) \
      INTERFACE_CHECK(HotplugHandler, (obj), TYPE_HOTPLUG_HANDLER)
 
-
-typedef struct HotplugHandler {
-    /* <private> */
-    Object Parent;
-} HotplugHandler;
+typedef struct HotplugHandler HotplugHandler;
 
 /**
  * hotplug_fn:
diff --git a/include/hw/intc/intc.h b/include/hw/intc/intc.h
index 27d9828943..fb3e8e621f 100644
--- a/include/hw/intc/intc.h
+++ b/include/hw/intc/intc.h
@@ -15,9 +15,7 @@
     INTERFACE_CHECK(InterruptStatsProvider, (obj), \
                     TYPE_INTERRUPT_STATS_PROVIDER)
 
-typedef struct InterruptStatsProvider {
-    Object parent;
-} InterruptStatsProvider;
+typedef struct InterruptStatsProvider InterruptStatsProvider;
 
 typedef struct InterruptStatsProviderClass {
     InterfaceClass parent;
diff --git a/include/hw/ipmi/ipmi.h b/include/hw/ipmi/ipmi.h
index 0affe5a4d8..99661d2bf0 100644
--- a/include/hw/ipmi/ipmi.h
+++ b/include/hw/ipmi/ipmi.h
@@ -114,9 +114,7 @@ uint32_t ipmi_next_uuid(void);
 #define IPMI_INTERFACE_GET_CLASS(class) \
      OBJECT_GET_CLASS(IPMIInterfaceClass, (class), TYPE_IPMI_INTERFACE)
 
-typedef struct IPMIInterface {
-    Object parent;
-} IPMIInterface;
+typedef struct IPMIInterface IPMIInterface;
 
 typedef struct IPMIInterfaceClass {
     InterfaceClass parent;
diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
index b9dbab24b4..e62ac91c19 100644
--- a/include/hw/isa/isa.h
+++ b/include/hw/isa/isa.h
@@ -43,10 +43,6 @@ static inline uint16_t applesmc_port(void)
 #define ISADMA(obj) \
     INTERFACE_CHECK(IsaDma, (obj), TYPE_ISADMA)
 
-struct IsaDma {
-    Object parent;
-};
-
 typedef enum {
     ISADMA_TRANSFER_VERIFY,
     ISADMA_TRANSFER_READ,
diff --git a/include/hw/mem/memory-device.h b/include/hw/mem/memory-device.h
index e904e194d5..0293a96abb 100644
--- a/include/hw/mem/memory-device.h
+++ b/include/hw/mem/memory-device.h
@@ -25,9 +25,7 @@
 #define MEMORY_DEVICE(obj) \
      INTERFACE_CHECK(MemoryDeviceState, (obj), TYPE_MEMORY_DEVICE)
 
-typedef struct MemoryDeviceState {
-    Object parent_obj;
-} MemoryDeviceState;
+typedef struct MemoryDeviceState MemoryDeviceState;
 
 /**
  * MemoryDeviceClass:
diff --git a/include/hw/nmi.h b/include/hw/nmi.h
index d092c684a1..ad857f3832 100644
--- a/include/hw/nmi.h
+++ b/include/hw/nmi.h
@@ -34,9 +34,7 @@
 #define NMI(obj) \
      INTERFACE_CHECK(NMI, (obj), TYPE_NMI)
 
-typedef struct NMIState {
-    Object parent_obj;
-} NMIState;
+typedef struct NMIState NMIState;
 
 typedef struct NMIClass {
     InterfaceClass parent_class;
diff --git a/include/hw/stream.h b/include/hw/stream.h
index c370ba0c66..15774f07ab 100644
--- a/include/hw/stream.h
+++ b/include/hw/stream.h
@@ -14,9 +14,7 @@
 #define STREAM_SLAVE(obj) \
      INTERFACE_CHECK(StreamSlave, (obj), TYPE_STREAM_SLAVE)
 
-typedef struct StreamSlave {
-    Object Parent;
-} StreamSlave;
+typedef struct StreamSlave StreamSlave;
 
 typedef void (*StreamCanPushNotifyFn)(void *opaque);
 
diff --git a/include/hw/timer/m48t59.h b/include/hw/timer/m48t59.h
index db5e43a8da..6f8db04fce 100644
--- a/include/hw/timer/m48t59.h
+++ b/include/hw/timer/m48t59.h
@@ -13,9 +13,7 @@
 #define NVRAM(obj) \
     INTERFACE_CHECK(Nvram, (obj), TYPE_NVRAM)
 
-typedef struct Nvram {
-    Object parent;
-} Nvram;
+typedef struct Nvram Nvram;
 
 typedef struct NvramClass {
     InterfaceClass parent;
diff --git a/include/qom/object_interfaces.h b/include/qom/object_interfaces.h
index 4d513fb329..652a16d2ba 100644
--- a/include/qom/object_interfaces.h
+++ b/include/qom/object_interfaces.h
@@ -16,11 +16,7 @@
      INTERFACE_CHECK(UserCreatable, (obj), \
                      TYPE_USER_CREATABLE)
 
-
-typedef struct UserCreatable {
-    /* <private> */
-    Object Parent;
-} UserCreatable;
+typedef struct UserCreatable UserCreatable;
 
 /**
  * UserCreatableClass:
diff --git a/include/sysemu/tpm.h b/include/sysemu/tpm.h
index 17a97ed77a..5b541a71c8 100644
--- a/include/sysemu/tpm.h
+++ b/include/sysemu/tpm.h
@@ -33,9 +33,7 @@ typedef enum TPMVersion {
 #define TPM_IF(obj)                             \
     INTERFACE_CHECK(TPMIf, (obj), TYPE_TPM_IF)
 
-typedef struct TPMIf {
-    Object parent_obj;
-} TPMIf;
+typedef struct TPMIf TPMIf;
 
 typedef struct TPMIfClass {
     InterfaceClass parent_class;
diff --git a/target/arm/idau.h b/target/arm/idau.h
index cac27b95fa..7c0e4e3776 100644
--- a/target/arm/idau.h
+++ b/target/arm/idau.h
@@ -38,9 +38,7 @@
 #define IDAU_INTERFACE_GET_CLASS(obj) \
     OBJECT_GET_CLASS(IDAUInterfaceClass, (obj), TYPE_IDAU_INTERFACE)
 
-typedef struct IDAUInterface {
-    Object parent;
-} IDAUInterface;
+typedef struct IDAUInterface IDAUInterface;
 
 #define IREGION_NOTVALID -1
 
diff --git a/tests/check-qom-interface.c b/tests/check-qom-interface.c
index f87c9aaa8a..2177f0dce5 100644
--- a/tests/check-qom-interface.c
+++ b/tests/check-qom-interface.c
@@ -23,9 +23,7 @@
 #define TEST_IF(obj) \
      INTERFACE_CHECK(TestIf, (obj), TYPE_TEST_IF)
 
-typedef struct TestIf {
-    Object parent_obj;
-} TestIf;
+typedef struct TestIf TestIf;
 
 typedef struct TestIfClass {
     InterfaceClass parent_class;