diff --git a/autoware_launch/config/map/lanelet2_map_loader.param.yaml b/autoware_launch/config/map/lanelet2_map_loader.param.yaml
index 48152605ec..48d392a1b8 100755
--- a/autoware_launch/config/map/lanelet2_map_loader.param.yaml
+++ b/autoware_launch/config/map/lanelet2_map_loader.param.yaml
@@ -1,5 +1,6 @@
 /**:
   ros__parameters:
+    allow_unsupported_version: true             # flag to load unsupported format_version anyway. If true, just prints warning.
     center_line_resolution: 5.0                 # [m]
     use_waypoints: true                         # "centerline" in the Lanelet2 map will be used as a "waypoints" tag.
     lanelet2_map_path: $(var lanelet2_map_path) # The lanelet2 map path