diff --git a/hw/timer/exynos4210_rtc.c b/hw/timer/exynos4210_rtc.c
index 7fca071f1d37fb3b714f47161aaad5fecb135426..3f2c8c55785df2232fe0a05e2058c919d1be70d3 100644
--- a/hw/timer/exynos4210_rtc.c
+++ b/hw/timer/exynos4210_rtc.c
@@ -79,8 +79,13 @@
 
 #define     RTC_BASE_FREQ       32768
 
+#define TYPE_EXYNOS4210_RTC "exynos4210.rtc"
+#define EXYNOS4210_RTC(obj) \
+    OBJECT_CHECK(Exynos4210RTCState, (obj), TYPE_EXYNOS4210_RTC)
+
 typedef struct Exynos4210RTCState {
-    SysBusDevice busdev;
+    SysBusDevice parent_obj;
+
     MemoryRegion iomem;
 
     /* registers */
@@ -507,7 +512,7 @@ static void exynos4210_rtc_write(void *opaque, hwaddr offset,
  */
 static void exynos4210_rtc_reset(DeviceState *d)
 {
-    Exynos4210RTCState *s = (Exynos4210RTCState *)d;
+    Exynos4210RTCState *s = EXYNOS4210_RTC(d);
 
     qemu_get_timedate(&s->current_tm, 0);
 
@@ -544,7 +549,7 @@ static const MemoryRegionOps exynos4210_rtc_ops = {
  */
 static int exynos4210_rtc_init(SysBusDevice *dev)
 {
-    Exynos4210RTCState *s = FROM_SYSBUS(Exynos4210RTCState, dev);
+    Exynos4210RTCState *s = EXYNOS4210_RTC(dev);
     QEMUBH *bh;
 
     bh = qemu_bh_new(exynos4210_rtc_tick, s);
@@ -577,7 +582,7 @@ static void exynos4210_rtc_class_init(ObjectClass *klass, void *data)
 }
 
 static const TypeInfo exynos4210_rtc_info = {
-    .name          = "exynos4210.rtc",
+    .name          = TYPE_EXYNOS4210_RTC,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(Exynos4210RTCState),
     .class_init    = exynos4210_rtc_class_init,