diff --git a/data_processor.py b/data_processor.py
index 58c1b7c3..66bba975 100644
--- a/data_processor.py
+++ b/data_processor.py
@@ -47,6 +47,7 @@ from helpers import (
     verify_wiki_article_chatgpt,
     generate_fsm_pitch,
     get_col_idx,
+    _get_col_letter,
     summarize_wikipedia_article,
     evaluate_branches_batch
 )
@@ -5759,7 +5760,7 @@ class DataProcessor:
                 
                 col_idx = get_col_idx("Geschaetzter Techniker Bucket")
                 if col_idx is not None:
-                    col_letter = self.sheet_handler._get_col_letter(col_idx + 1)
+                    col_letter = _get_col_letter(col_idx + 1)
                     all_updates.append({'range': f'{col_letter}{row_num}', 'values': [[predicted_bucket]]})
                 
                 processed_count += 1