diff --git a/test/functional/feature_reindex.py b/test/functional/feature_reindex.py
--- a/test/functional/feature_reindex.py
+++ b/test/functional/feature_reindex.py
@@ -24,7 +24,7 @@
         blockcount = self.nodes[0].getblockcount()
         self.stop_nodes()
         extra_args = [
-            ["-reindex-chainstate" if justchainstate else "-reindex", "-checkblockindex=1"]]
+            ["-reindex-chainstate" if justchainstate else "-reindex"]]
         self.start_nodes(extra_args)
         wait_until(lambda: self.nodes[0].getblockcount() == blockcount)
         self.log.info("Success")
diff --git a/test/functional/mempool_accept.py b/test/functional/mempool_accept.py
--- a/test/functional/mempool_accept.py
+++ b/test/functional/mempool_accept.py
@@ -33,7 +33,6 @@
     def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [[
-            '-checkmempool',
             '-txindex',
             '-reindex',  # Need reindex for txindex
             '-acceptnonstdtxn=0',  # Try to mimic main-net
diff --git a/test/functional/mempool_reorg.py b/test/functional/mempool_reorg.py
--- a/test/functional/mempool_reorg.py
+++ b/test/functional/mempool_reorg.py
@@ -12,13 +12,10 @@
 from test_framework.blocktools import create_raw_transaction
 from test_framework.util import assert_equal, assert_raises_rpc_error
 
-# Create one-input, one-output, no-fee transaction:
-
 
 class MempoolCoinbaseTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 2
-        self.extra_args = [["-checkmempool"]] * 2
 
     alert_filename = None  # Set by setup_network
 
diff --git a/test/functional/mempool_resurrect.py b/test/functional/mempool_resurrect.py
--- a/test/functional/mempool_resurrect.py
+++ b/test/functional/mempool_resurrect.py
@@ -8,13 +8,10 @@
 from test_framework.blocktools import create_raw_transaction
 from test_framework.util import assert_equal
 
-# Create one-input, one-output, no-fee transaction:
-
 
 class MempoolCoinbaseTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
-        self.extra_args = [["-checkmempool"]]
 
     def run_test(self):
         node0_address = self.nodes[0].getnewaddress()
diff --git a/test/functional/mempool_spend_coinbase.py b/test/functional/mempool_spend_coinbase.py
--- a/test/functional/mempool_spend_coinbase.py
+++ b/test/functional/mempool_spend_coinbase.py
@@ -16,13 +16,10 @@
 from test_framework.blocktools import create_raw_transaction
 from test_framework.util import assert_equal, assert_raises_rpc_error
 
-# Create one-input, one-output, no-fee transaction:
-
 
 class MempoolSpendCoinbaseTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
-        self.extra_args = [["-checkmempool"]]
 
     def run_test(self):
         chain_height = self.nodes[0].getblockcount()