diff --git a/scripts/combining_dfs.py b/scripts/combining_dfs.py
index eab2808..af8be26 100755
--- a/scripts/combining_dfs.py
+++ b/scripts/combining_dfs.py
@@ -487,7 +487,7 @@ all_cols = combined_df_all.columns
 first_cols = ['mutationinformation','mutation', 'wild_type', 'position', 'mutant_type']
 last_cols = [col for col in combined_df_all.columns if col not in first_cols]
 
-df = combined_df_all[first_cols+last_cols]
+combined_df_all = combined_df_all[first_cols+last_cols]
 
 #%% IMPORTANT: check if mutation related info is all populated after this merge  
 # select string colnames to ensure no NA exist there