diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index 3a770f3b78..fd5236690a 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -1283,6 +1283,7 @@ static const TypeInfo ps2_info = {
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(PS2State),
     .class_init    = ps2_class_init,
+    .class_size    = sizeof(PS2DeviceClass),
     .abstract      = true
 };
 
diff --git a/include/hw/input/ps2.h b/include/hw/input/ps2.h
index 1a3321d77e..aef892b5e6 100644
--- a/include/hw/input/ps2.h
+++ b/include/hw/input/ps2.h
@@ -33,6 +33,10 @@
 #define PS2_MOUSE_BUTTON_SIDE   0x08
 #define PS2_MOUSE_BUTTON_EXTRA  0x10
 
+struct PS2DeviceClass {
+    SysBusDeviceClass parent_class;
+};
+
 /*
  * PS/2 buffer size. Keep 256 bytes for compatibility with
  * older QEMU versions.
@@ -54,7 +58,7 @@ struct PS2State {
 };
 
 #define TYPE_PS2_DEVICE "ps2-device"
-OBJECT_DECLARE_SIMPLE_TYPE(PS2State, PS2_DEVICE)
+OBJECT_DECLARE_TYPE(PS2State, PS2DeviceClass, PS2_DEVICE)
 
 struct PS2KbdState {
     PS2State parent_obj;