diff --git a/ros2topic/test/test_echo_pub.py b/ros2topic/test/test_echo_pub.py
index 3f6fa55f3..b08558e92 100644
--- a/ros2topic/test/test_echo_pub.py
+++ b/ros2topic/test/test_echo_pub.py
@@ -42,7 +42,7 @@
 
 @pytest.mark.rostest
 @launch_testing.markers.keep_alive
-def generate_test_description(ready_fn):
+def generate_test_description():
     return LaunchDescription([
         # Always restart daemon to isolate tests.
         ExecuteProcess(