diff --git a/src/cardano_account_pandas_dumper/cardano_account_pandas_dumper.py b/src/cardano_account_pandas_dumper/cardano_account_pandas_dumper.py
index 84f8482..0dcd57e 100644
--- a/src/cardano_account_pandas_dumper/cardano_account_pandas_dumper.py
+++ b/src/cardano_account_pandas_dumper/cardano_account_pandas_dumper.py
@@ -452,5 +452,5 @@ def make_transaction_frame(self) -> pd.DataFrame:
         )
         frame = frame.merge(balance, left_index=True, right_index=True)
         frame.drop_duplicates(inplace=True)
-        frame.sort_values(by=frame.columns[1], inplace=True)
+        frame.sort_values(by=frame.columns[0], inplace=True)
         return frame