diff --git a/edge_auto_jetson_launch/launch/perception_jetson0.launch.xml b/edge_auto_jetson_launch/launch/perception_jetson0.launch.xml
index d87084b..8689efa 100644
--- a/edge_auto_jetson_launch/launch/perception_jetson0.launch.xml
+++ b/edge_auto_jetson_launch/launch/perception_jetson0.launch.xml
@@ -44,7 +44,7 @@
         <arg name="output/objects" value="/perception/object_recognition/detection/rois$(var camera_id)" />
       </include>
 
-      <let name="tensorrt_lightnet_is_installed" value="$(eval 'not &quot;$(find-pkg-share tensorrt_lightnet)&quot;')" />
+      <arg name="tensorrt_lightnet_is_installed" default="false" />
       <include file="$(find-pkg-share tensorrt_lightnet)/launch/tensorrt_lightnet.launch.xml" if="$(var tensorrt_lightnet_is_installed)">
         <arg name="container_name" value="$(var container_name)" />
         <arg name="input/image" value="/sensing/camera/$(var camera_name)/image_raw" />