diff --git a/rmf_building_map_tools/building_map/generator.py b/rmf_building_map_tools/building_map/generator.py
index f47d5afa..05ea9250 100644
--- a/rmf_building_map_tools/building_map/generator.py
+++ b/rmf_building_map_tools/building_map/generator.py
@@ -21,7 +21,7 @@ def generate_sdf(
         self,
         input_filename,
         output_filename,
-        output_models_dir)
+        output_models_dir
     ):
         print('generating {} from {}'.format(output_filename, input_filename))