diff --git a/params/costmap/common_params.yaml b/params/costmap/common_params.yaml
index fb961cc73f2411d9cbbfd67a8f039e302f942d5d..d132f55bfd98956b25acabe58d4aa7bf15baf20b 100644
--- a/params/costmap/common_params.yaml
+++ b/params/costmap/common_params.yaml
@@ -32,14 +32,14 @@ obstacle_layer:
   observation_sources:  scan bump
   scan:
     data_type: LaserScan
-    topic: scan
+    topic: /scan
     marking: true
     clearing: true
     min_obstacle_height: 0.25
     max_obstacle_height: 0.35
   bump:
     data_type: PointCloud2
-    topic: mobile_base/sensors/bumper_pointcloud
+    topic: /mobile_base/sensors/bumper_pointcloud
     marking: true
     clearing: false
     min_obstacle_height: 0.0