diff --git a/src/sakia/data/entities/transaction.py b/src/sakia/data/entities/transaction.py
index d6fa67b1e19e0a3243513d3c768c5ccd1facf16b..1d02ce1a4553738c132eb02202402765ec9da2c9 100644
--- a/src/sakia/data/entities/transaction.py
+++ b/src/sakia/data/entities/transaction.py
@@ -7,7 +7,7 @@ from sakia.helpers import attrs_tuple_of_str
 import math
 
 
-STOPLINE_HASH = hashlib.sha256("Stopline").hexdigest()
+STOPLINE_HASH = hashlib.sha256("STOPLINE".encode("UTF-8")).hexdigest()
 
 def parse_transaction_doc(tx_doc, pubkey, block_number, mediantime, txid):
     """