diff --git a/test/functional/feature_csv_activation.py b/test/functional/feature_csv_activation.py
--- a/test/functional/feature_csv_activation.py
+++ b/test/functional/feature_csv_activation.py
@@ -58,6 +58,7 @@
     OP_TRUE,
 )
 from test_framework.test_framework import ComparisonTestFramework
+from test_framework.txtools import pad_tx
 from test_framework.util import assert_equal
 
 base_relative_locktime = 10
@@ -142,6 +143,7 @@
         spendtx = self.create_transaction(
             node, prev_tx.hash, self.nodeaddress, (prev_tx.vout[0].nValue - 1000) / COIN)
         spendtx.nVersion = prev_tx.nVersion
+        pad_tx(spendtx)
         spendtx.rehash()
         return spendtx
 
diff --git a/test/functional/test_framework/blocktools.py b/test/functional/test_framework/blocktools.py
--- a/test/functional/test_framework/blocktools.py
+++ b/test/functional/test_framework/blocktools.py
@@ -48,7 +48,6 @@
 
 def make_conform_to_ctor(block):
     for tx in block.vtx:
-        pad_tx(tx)
         tx.rehash()
     block.vtx = [block.vtx[0]] + \
         sorted(block.vtx[1:], key=lambda tx: tx.get_id())