diff --git a/kitty_tests/__init__.py b/kitty_tests/__init__.py
index bd9ce655f..2af8f7a3c 100644
--- a/kitty_tests/__init__.py
+++ b/kitty_tests/__init__.py
@@ -402,7 +402,7 @@ class PTY:
             self.process_input_from_child(0)
 
     def send_da1_response(self, data: str) -> None:
-        self.write_to_child('\x1b[' + data, flush=True)
+        self.write_to_child('\x1b[' + data, flush=False) # ]]]]]]
 
     def send_cmd_to_child(self, cmd, flush=False):
         self.callbacks.last_cmd_exit_status = sys.maxsize