1 files changed, 1 insertions, 2 deletions
diff --git a/test/functional/feature_cltv.py b/test/functional/feature_cltv.py
index 96c5e49b0e..b422bf2873 100755
--- a/test/functional/feature_cltv.py
+++ b/test/functional/feature_cltv.py
@@ -15,7 +15,6 @@ from test_framework.script import CScript, OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, O
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
-    bytes_to_hex_str,
     hex_str_to_bytes,
 )
 
@@ -114,7 +113,7 @@ class BIP65Test(BitcoinTestFramework):
         # rejected from the mempool for exactly that reason.
         assert_equal(
             [{'txid': spendtx.hash, 'allowed': False, 'reject-reason': '64: non-mandatory-script-verify-flag (Negative locktime)'}],
-            self.nodes[0].testmempoolaccept(rawtxs=[bytes_to_hex_str(spendtx.serialize())], allowhighfees=True)
+            self.nodes[0].testmempoolaccept(rawtxs=[spendtx.serialize().hex()], allowhighfees=True)
         )
 
         # Now we verify that a block with this transaction is also invalid.