diff --git a/src/mcbluetooth/dbus_client.py b/src/mcbluetooth/dbus_client.py
index 4536f86..c3cc5ea 100644
--- a/src/mcbluetooth/dbus_client.py
+++ b/src/mcbluetooth/dbus_client.py
@@ -569,7 +569,7 @@ class BlueZClient:
         """
         iface = await self._get_interface(char_path, BLUEZ_GATT_CHAR_IFACE)
         options = {"type": Variant("s", write_type)}
-        await iface.call_write_value(list(value), options)
+        await iface.call_write_value(bytearray(value), options)
 
     async def start_notify(self, char_path: str) -> None:
         """Start notifications for a characteristic."""