diff --git a/hw/arm/musicpal.c b/hw/arm/musicpal.c
index b3624d5e2801933d00c887333cc5f90101633e65..f68a399a9840565afb9e6ba73cce57e9f43342ad 100644
--- a/hw/arm/musicpal.c
+++ b/hw/arm/musicpal.c
@@ -843,13 +843,10 @@ static void mv88w8618_timer_tick(void *opaque)
 static void mv88w8618_timer_init(SysBusDevice *dev, mv88w8618_timer_state *s,
                                  uint32_t freq)
 {
-    QEMUBH *bh;
-
     sysbus_init_irq(dev, &s->irq);
     s->freq = freq;
 
-    bh = qemu_bh_new(mv88w8618_timer_tick, s);
-    s->ptimer = ptimer_init_with_bh(bh, PTIMER_POLICY_DEFAULT);
+    s->ptimer = ptimer_init(mv88w8618_timer_tick, s, PTIMER_POLICY_DEFAULT);
 }
 
 static uint64_t mv88w8618_pit_read(void *opaque, hwaddr offset,
@@ -879,16 +876,19 @@ static void mv88w8618_pit_write(void *opaque, hwaddr offset,
     case MP_PIT_TIMER1_LENGTH ... MP_PIT_TIMER4_LENGTH:
         t = &s->timer[offset >> 2];
         t->limit = value;
+        ptimer_transaction_begin(t->ptimer);
         if (t->limit > 0) {
             ptimer_set_limit(t->ptimer, t->limit, 1);
         } else {
             ptimer_stop(t->ptimer);
         }
+        ptimer_transaction_commit(t->ptimer);
         break;
 
     case MP_PIT_CONTROL:
         for (i = 0; i < 4; i++) {
             t = &s->timer[i];
+            ptimer_transaction_begin(t->ptimer);
             if (value & 0xf && t->limit > 0) {
                 ptimer_set_limit(t->ptimer, t->limit, 0);
                 ptimer_set_freq(t->ptimer, t->freq);
@@ -896,6 +896,7 @@ static void mv88w8618_pit_write(void *opaque, hwaddr offset,
             } else {
                 ptimer_stop(t->ptimer);
             }
+            ptimer_transaction_commit(t->ptimer);
             value >>= 4;
         }
         break;
@@ -914,8 +915,11 @@ static void mv88w8618_pit_reset(DeviceState *d)
     int i;
 
     for (i = 0; i < 4; i++) {
-        ptimer_stop(s->timer[i].ptimer);
-        s->timer[i].limit = 0;
+        mv88w8618_timer_state *t = &s->timer[i];
+        ptimer_transaction_begin(t->ptimer);
+        ptimer_stop(t->ptimer);
+        ptimer_transaction_commit(t->ptimer);
+        t->limit = 0;
     }
 }