diff --git a/libfwupdplugin/fu-bluez-device.h b/libfwupdplugin/fu-bluez-device.h
index b2084aa1e..af59b7b00 100644
--- a/libfwupdplugin/fu-bluez-device.h
+++ b/libfwupdplugin/fu-bluez-device.h
@@ -13,7 +13,6 @@ G_DECLARE_DERIVABLE_TYPE(FuBluezDevice, fu_bluez_device, FU, BLUEZ_DEVICE, FuDev
 
 struct _FuBluezDeviceClass {
 	FuDeviceClass parent_class;
-	gpointer __reserved[31];
 };
 
 GByteArray *
diff --git a/libfwupdplugin/fu-cfi-device.h b/libfwupdplugin/fu-cfi-device.h
index 08dd4dfdb..a3b66097b 100644
--- a/libfwupdplugin/fu-cfi-device.h
+++ b/libfwupdplugin/fu-cfi-device.h
@@ -14,7 +14,6 @@ G_DECLARE_DERIVABLE_TYPE(FuCfiDevice, fu_cfi_device, FU, CFI_DEVICE, FuDevice)
 struct _FuCfiDeviceClass {
 	FuDeviceClass parent_class;
 	gboolean (*chip_select)(FuCfiDevice *self, gboolean value, GError **error);
-	gpointer __reserved[30];
 };
 
 /**
diff --git a/libfwupdplugin/fu-hid-device.h b/libfwupdplugin/fu-hid-device.h
index 324b76db3..d7813b53b 100644
--- a/libfwupdplugin/fu-hid-device.h
+++ b/libfwupdplugin/fu-hid-device.h
@@ -13,7 +13,6 @@ G_DECLARE_DERIVABLE_TYPE(FuHidDevice, fu_hid_device, FU, HID_DEVICE, FuUsbDevice
 
 struct _FuHidDeviceClass {
 	FuUsbDeviceClass parent_class;
-	gpointer __reserved[31];
 };
 
 /**
diff --git a/libfwupdplugin/fu-i2c-device.h b/libfwupdplugin/fu-i2c-device.h
index 29562e93f..9c8b5a47f 100644
--- a/libfwupdplugin/fu-i2c-device.h
+++ b/libfwupdplugin/fu-i2c-device.h
@@ -13,7 +13,6 @@ G_DECLARE_DERIVABLE_TYPE(FuI2cDevice, fu_i2c_device, FU, I2C_DEVICE, FuUdevDevic
 
 struct _FuI2cDeviceClass {
 	FuUdevDeviceClass parent_class;
-	gpointer __reserved[31];
 };
 
 guint
diff --git a/libfwupdplugin/fu-mei-device.h b/libfwupdplugin/fu-mei-device.h
index 5ec749527..3b73b996d 100644
--- a/libfwupdplugin/fu-mei-device.h
+++ b/libfwupdplugin/fu-mei-device.h
@@ -13,7 +13,6 @@ G_DECLARE_DERIVABLE_TYPE(FuMeiDevice, fu_mei_device, FU, MEI_DEVICE, FuUdevDevic
 
 struct _FuMeiDeviceClass {
 	FuUdevDeviceClass parent_class;
-	gpointer __reserved[31];
 };
 
 gboolean
diff --git a/libfwupdplugin/fu-udev-device.h b/libfwupdplugin/fu-udev-device.h
index 5c78aeff1..05cf1ecb5 100644
--- a/libfwupdplugin/fu-udev-device.h
+++ b/libfwupdplugin/fu-udev-device.h
@@ -27,7 +27,6 @@ G_DECLARE_DERIVABLE_TYPE(FuUdevDevice, fu_udev_device, FU, UDEV_DEVICE, FuDevice
 
 struct _FuUdevDeviceClass {
 	FuDeviceClass parent_class;
-	gpointer __reserved[31];
 };
 
 /**
diff --git a/libfwupdplugin/fu-usb-device.h b/libfwupdplugin/fu-usb-device.h
index e56489a2f..38b3e144c 100644
--- a/libfwupdplugin/fu-usb-device.h
+++ b/libfwupdplugin/fu-usb-device.h
@@ -24,7 +24,6 @@ G_DECLARE_DERIVABLE_TYPE(FuUsbDevice, fu_usb_device, FU, USB_DEVICE, FuDevice)
 
 struct _FuUsbDeviceClass {
 	FuDeviceClass parent_class;
-	gpointer __reserved[31];
 };
 
 FuUsbDevice *