diff --git a/examples/posim_demos/launch/posim_robot.launch.py b/examples/posim_demos/launch/posim_robot.launch.py
index d3218247..d0ee5e63 100644
--- a/examples/posim_demos/launch/posim_robot.launch.py
+++ b/examples/posim_demos/launch/posim_robot.launch.py
@@ -52,11 +52,13 @@ def launch_setup(context, *args, **kwargs):
         world_entity_name = "empty"
         gz_args = [world_name]
 
-    zoom_camera_value = "true" if selected_world_name == "posim_ocean_waves" else "false"
-
     run_server_only = (
         headless.perform(context).lower() == "true" or gui.perform(context).lower() == "false"
     )
+    # A server-only launch has no GUI camera service to move.
+    zoom_camera_value = (
+        "true" if selected_world_name == "posim_ocean_waves" and not run_server_only else "false"
+    )
     if run_server_only:
         gz_args.append(" -s")
     if paused.perform(context) == "false":