diff --git a/common_task.py b/common_task.py
index a254c9a..3ce2a17 100644
--- a/common_task.py
+++ b/common_task.py
@@ -57,7 +57,7 @@ def do_the_difference(today_file, last_file, column_for_diff, fresh_output, expi
     child_df_copy = expired_df.copy()
     if gi =="g":
         child_df_copy['Job Key'] = 'g_' + child_df_copy['Job Key'].astype(str)
-        expired_df['Job key'] = expired_df['Job key'].astype(str)
+        expired_df['Job Key'] = expired_df['Job Key'].astype(str)
         expired_df = pd.concat([expired_df, child_df_copy], ignore_index=True)
     else: # jobId
         child_df_copy['jobId'] = 'i_' + child_df_copy['jobId'].astype(str)