diff --git a/acmc/phen.py b/acmc/phen.py
index 64f6b4983db7a362a9e0f225686877fb4f9b41a8..9b82186d7b4cc7c82b530d5bc1ca86bbe0edc03e 100644
--- a/acmc/phen.py
+++ b/acmc/phen.py
@@ -704,7 +704,9 @@ def translate_codes(
                 codes = _translate_codes(map_path, source_df, source_code_type, codes)
             # otherwise do reverse mapping if enabled and it exists
             elif do_reverse_translate and map_path_reversed.exists():
-                codes = _translate_codes(map_path_reversed, source_df, source_code_type, codes)
+                codes = _translate_codes(
+                    map_path_reversed, source_df, source_code_type, codes
+                )
             else:
                 _logger.warning(
                     f"No mapping from {source_code_type} to {target_code_type}, file {str(map_path.resolve())} does not exist"