diff --git a/py9b/link/bleak.py b/py9b/link/bleak.py
index 7e27273..5bf9312 100644
--- a/py9b/link/bleak.py
+++ b/py9b/link/bleak.py
@@ -105,7 +105,7 @@ class BleakLink(BaseLink):
 
     def write(self, data):
         fut = asyncio.run_coroutine_threadsafe(
-            self._client.write_gatt_char(_rx_char_uuid, bytearray(data), False),
+            self._client.write_gatt_char(_rx_char_uuid, bytearray(data), True),
             self.loop,
         )
         return fut.result(3)