diff --git a/concatenator/concat_with_nco_cli.py b/concatenator/concat_with_nco_cli.py
index e747ffe..1537da7 100644
--- a/concatenator/concat_with_nco_cli.py
+++ b/concatenator/concat_with_nco_cli.py
@@ -14,7 +14,7 @@ def run_nco_concat(args: list) -> None:
     """
     Parse arguments and run subsetter on the specified input file
     """
-    input_files, output_path, keep_tmp_files, temporary_dir_to_remove = parse_args(args)
+    input_files, output_path, _, keep_tmp_files, temporary_dir_to_remove = parse_args(args)
     num_inputs = len(input_files)
 
     logging.info('Executing NCO concatenation on %d files...', num_inputs)