diff --git a/qa/rpc-tests/mempool_nu_activation.py b/qa/rpc-tests/mempool_nu_activation.py
index 8d2e8433c..aa402a70a 100755
--- a/qa/rpc-tests/mempool_nu_activation.py
+++ b/qa/rpc-tests/mempool_nu_activation.py
@@ -45,7 +45,7 @@ class MempoolUpgradeActivationTest(BitcoinTestFramework):
         node1_taddr = get_coinbase_address(self.nodes[1])
         node0_zaddr = self.nodes[0].z_getnewaddress('sapling')
         recipients = [{'address': node0_zaddr, 'amount': Decimal('10')}]
-        myopid = self.nodes[1].z_sendmany(node1_taddr, recipients, 1, Decimal('0'))
+        myopid = self.nodes[1].z_sendmany(node1_taddr, recipients, 1, 0)
         print(wait_and_assert_operationid_status(self.nodes[1], myopid))
         self.sync_all()
         self.nodes[0].generate(1)
@@ -130,7 +130,7 @@ class MempoolUpgradeActivationTest(BitcoinTestFramework):
 
             # Create a shielded Y transaction
             recipients = [{'address': node0_zaddr, 'amount': Decimal('10')}]
-            myopid = self.nodes[0].z_sendmany(node0_zaddr, recipients, 1, Decimal('0'))
+            myopid = self.nodes[0].z_sendmany(node0_zaddr, recipients, 1,0)
             shielded = wait_and_assert_operationid_status(self.nodes[0], myopid)
             assert(shielded != None)
             y_txids.append(shielded)