diff --git a/launch/nav.launch b/launch/nav.launch
index a570c34f89854712c7ea3b6e3c15757fd84f0184..08b2ef28e2867081bc0d8c6c9c571d62173e2216 100644
--- a/launch/nav.launch
+++ b/launch/nav.launch
@@ -113,7 +113,7 @@
       <arg name="costmap_common_params"    value="$(arg costmap_common_params)"/>
       <arg name="costmap_local_params"     value="$(arg costmap_local_params)"/>
       <arg name="costmap_global_params"    value="$(arg costmap_global_params)"/>
-      <arg name="use_map"                  value="$(arg use_map_server)"/> 
+      <arg name="use_map"                  value="$(arg use_map)"/> 
       <arg name="map_topic"                value="$(arg map_topic)"/>
       <arg name="odom_topic"               value="$(arg odom_topic)"/>
       <arg name="cmd_vel_topic"            value="$(arg cmd_vel_topic)"/>