diff --git a/tracetools_analysis/launch/profile.launch.py b/tracetools_analysis/launch/profile.launch.py
index 9e10ef9..99822a7 100644
--- a/tracetools_analysis/launch/profile.launch.py
+++ b/tracetools_analysis/launch/profile.launch.py
@@ -34,11 +34,13 @@ def generate_launch_description():
         Node(
             package='tracetools_test',
             node_executable='test_ping',
+            arguments=['do_more'],
             output='screen',
         ),
         Node(
             package='tracetools_test',
             node_executable='test_pong',
+            arguments=['do_more'],
             output='screen',
         ),
     ])