diff --git a/stretch_navigation/config/common_costmap_params.yaml b/stretch_navigation/config/common_costmap_params.yaml
index 63ded00..dc090cd 100644
--- a/stretch_navigation/config/common_costmap_params.yaml
+++ b/stretch_navigation/config/common_costmap_params.yaml
@@ -3,6 +3,6 @@ raytrace_range: 3.0
 robot_radius: 0.5
 inflation_radius: 0.55
 
-observational_sources: laser_scan_sensor
+observation_sources: laser_scan_sensor
 
 laser_scan_sensor: {sensor_frame: laser, data_type: LaserScan, topic: scan, marking: true, clearing: true}