diff --git a/autoware_launch/config/map/lanelet2_map_loader.param.yaml b/autoware_launch/config/map/lanelet2_map_loader.param.yaml
index b830e038f1..1618078a46 100755
--- a/autoware_launch/config/map/lanelet2_map_loader.param.yaml
+++ b/autoware_launch/config/map/lanelet2_map_loader.param.yaml
@@ -1,4 +1,5 @@
 /**:
   ros__parameters:
+    allow_unsupported_version: true # flag to load unsupported format_version anyway. If true, just prints warning.
     center_line_resolution: 5.0         # [m]
     lanelet2_map_path: $(var lanelet2_map_path) # The lanelet2 map path