diff --git a/src/wormhole_cli/cmd_receive.py b/src/wormhole_cli/cmd_receive.py
index b95290e..23f89c0 100644
--- a/src/wormhole_cli/cmd_receive.py
+++ b/src/wormhole_cli/cmd_receive.py
@@ -128,7 +128,7 @@ class TwistedReceiver:
         # we're receiving a text message
         self.msg(them_d["message"])
         data = json.dumps({"message_ack": "ok"}).encode("utf-8")
-        yield w.send_data(data)
+        yield w.send_data(data, wait=True)
 
     def handle_file(self, them_d):
         file_data = them_d["file"]