diff --git a/bumble/device.py b/bumble/device.py
index 919e102e..5ce8d889 100644
--- a/bumble/device.py
+++ b/bumble/device.py
@@ -1166,14 +1166,11 @@ class BigSync(utils.EventEmitter):
             logger.error('BIG Sync %d is not active.', self.big_handle)
             return
 
-        with closing(utils.EventWatcher()) as watcher:
-            terminated = asyncio.Event()
-            watcher.once(self, BigSync.Event.TERMINATION, lambda _: terminated.set())
-            await self.device.send_command(
-                hci.HCI_LE_BIG_Terminate_Sync_Command(big_handle=self.big_handle),
-                check_result=True,
-            )
-            await terminated.wait()
+        await self.device.send_command(
+            hci.HCI_LE_BIG_Terminate_Sync_Command(big_handle=self.big_handle),
+            check_result=True,
+        )
+        self.state = BigSync.State.TERMINATED
 
 
 # -----------------------------------------------------------------------------
diff --git a/bumble/hci.py b/bumble/hci.py
index fd88b67a..59ef2711 100644
--- a/bumble/hci.py
+++ b/bumble/hci.py
@@ -5257,7 +5257,7 @@ class HCI_LE_BIG_Terminate_Sync_Command(HCI_Command):
 
     return_parameters_fields = [
         ('status', STATUS_SPEC),
-        ('big_handle', 2),
+        ('big_handle', 1),
     ]