diff --git a/internal/mempool/mempool.go b/internal/mempool/mempool.go
index 6fd5f0f3..6c980124 100644
--- a/internal/mempool/mempool.go
+++ b/internal/mempool/mempool.go
@@ -1351,7 +1351,7 @@ func (mp *TxPool) maybeAcceptTransaction(tx *dcrutil.Tx, isNew, rateLimit,
 	medianTime := mp.cfg.PastMedianTime()
 	if !mp.cfg.Policy.AcceptNonStd {
 		err := checkTransactionStandard(tx, txType, nextBlockHeight,
-			medianTime, mp.cfg.Policy.MinRelayTxFee, isTreasuryEnabled)
+			medianTime, mp.cfg.Policy.MinRelayTxFee)
 		if err != nil {
 			str := fmt.Sprintf("transaction %v is not standard: %v",
 				txHash, err)
diff --git a/internal/mempool/policy.go b/internal/mempool/policy.go
index 04bfd575..5f73e695 100644
--- a/internal/mempool/policy.go
+++ b/internal/mempool/policy.go
@@ -296,8 +296,7 @@ func isDust(txOut *wire.TxOut, minRelayTxFee dcrutil.Amount) bool {
 // Note: all non-nil errors MUST be RuleError with an underlying TxRuleError
 // instance.
 func checkTransactionStandard(tx *dcrutil.Tx, txType stake.TxType, height int64,
-	medianTime time.Time, minRelayTxFee dcrutil.Amount,
-	isTreasuryEnabled bool) error {
+	medianTime time.Time, minRelayTxFee dcrutil.Amount) error {
 
 	// The transaction must be a currently supported serialize type.
 	msgTx := tx.MsgTx()
diff --git a/internal/mempool/policy_test.go b/internal/mempool/policy_test.go
index 4382a068..affc475a 100644
--- a/internal/mempool/policy_test.go
+++ b/internal/mempool/policy_test.go
@@ -525,7 +525,7 @@ func TestCheckTransactionStandard(t *testing.T) {
 		txType := stake.DetermineTxType(&test.tx, noTreasury, noAutoRevocations)
 		tx := dcrutil.NewTx(&test.tx)
 		err := checkTransactionStandard(tx, txType, test.height, medianTime,
-			DefaultMinRelayTxFee, noTreasury)
+			DefaultMinRelayTxFee)
 		if err == nil && test.isStandard {
 			// Test passes since function returned standard for a
 			// transaction which is intended to be standard.
diff --git a/internal/mining/mining_harness_test.go b/internal/mining/mining_harness_test.go
index 09b5a2f7..46ff1048 100644
--- a/internal/mining/mining_harness_test.go
+++ b/internal/mining/mining_harness_test.go
@@ -426,7 +426,7 @@ func (p *fakeTxSource) fetchRedeemers(outpoints map[wire.OutPoint]*dcrutil.Tx,
 }
 
 // addOrphan adds the passed orphan transaction to the orphan pool.
-func (p *fakeTxSource) addOrphan(tx *dcrutil.Tx, isTreasuryEnabled bool) {
+func (p *fakeTxSource) addOrphan(tx *dcrutil.Tx) {
 	p.orphans[*tx.Hash()] = tx
 	for _, txIn := range tx.MsgTx().TxIn {
 		if _, exists := p.orphansByPrev[txIn.PreviousOutPoint]; !exists {
@@ -438,7 +438,7 @@ func (p *fakeTxSource) addOrphan(tx *dcrutil.Tx, isTreasuryEnabled bool) {
 }
 
 // removeOrphan removes the passed orphan transaction from the orphan pool.
-func (p *fakeTxSource) removeOrphan(tx *dcrutil.Tx, removeRedeemers bool, isTreasuryEnabled bool) {
+func (p *fakeTxSource) removeOrphan(tx *dcrutil.Tx, removeRedeemers bool) {
 	// Nothing to do if the passed tx does not exist in the orphan pool.
 	txHash := tx.Hash()
 	tx, exists := p.orphans[*txHash]
@@ -466,7 +466,7 @@ func (p *fakeTxSource) removeOrphan(tx *dcrutil.Tx, removeRedeemers bool, isTrea
 		for txOutIdx := range tx.MsgTx().TxOut {
 			prevOut.Index = uint32(txOutIdx)
 			for _, orphan := range p.orphansByPrev[prevOut] {
-				p.removeOrphan(orphan, true, isTreasuryEnabled)
+				p.removeOrphan(orphan, true)
 			}
 		}
 	}
@@ -480,11 +480,11 @@ func (p *fakeTxSource) removeOrphan(tx *dcrutil.Tx, removeRedeemers bool, isTrea
 // to removing all orphans which rely on them, recursively.  This is necessary
 // when a transaction is added to the main pool because it may spend outputs
 // that orphans also spend.
-func (p *fakeTxSource) removeOrphanDoubleSpends(tx *dcrutil.Tx, isTreasuryEnabled bool) {
+func (p *fakeTxSource) removeOrphanDoubleSpends(tx *dcrutil.Tx) {
 	msgTx := tx.MsgTx()
 	for _, txIn := range msgTx.TxIn {
 		for _, orphan := range p.orphansByPrev[txIn.PreviousOutPoint] {
-			p.removeOrphan(orphan, true, isTreasuryEnabled)
+			p.removeOrphan(orphan, true)
 		}
 	}
 }
@@ -839,7 +839,7 @@ func (p *fakeTxSource) processOrphans(acceptedTx *dcrutil.Tx, isTreasuryEnabled,
 				if err != nil {
 					// The orphan is now invalid, so there is no way any other orphans which
 					// redeem any of its outputs can be accepted.  Remove them.
-					p.removeOrphan(tx, true, isTreasuryEnabled)
+					p.removeOrphan(tx, true)
 					break
 				}
 
@@ -855,7 +855,7 @@ func (p *fakeTxSource) processOrphans(acceptedTx *dcrutil.Tx, isTreasuryEnabled,
 				// remove it from the orphan pool, and add it to the list of transactions to
 				// process so any orphans that depend on it are handled too.
 				acceptedTxns = append(acceptedTxns, tx)
-				p.removeOrphan(tx, false, isTreasuryEnabled)
+				p.removeOrphan(tx, false)
 				processList = append(processList, tx)
 
 				// Only one transaction for this outpoint can be accepted, so the rest are
@@ -867,9 +867,9 @@ func (p *fakeTxSource) processOrphans(acceptedTx *dcrutil.Tx, isTreasuryEnabled,
 
 	// Recursively remove any orphans that also redeem any outputs redeemed by the
 	// accepted transactions since those are now definitive double spends.
-	p.removeOrphanDoubleSpends(acceptedTx, isTreasuryEnabled)
+	p.removeOrphanDoubleSpends(acceptedTx)
 	for _, tx := range acceptedTxns {
-		p.removeOrphanDoubleSpends(tx, isTreasuryEnabled)
+		p.removeOrphanDoubleSpends(tx)
 	}
 
 	return acceptedTxns
@@ -901,7 +901,7 @@ func (p *fakeTxSource) ProcessTransaction(tx *dcrutil.Tx) ([]*dcrutil.Tx, error)
 	}
 
 	// Add the orphan transaction to the tx source.
-	p.addOrphan(tx, isTreasuryEnabled)
+	p.addOrphan(tx)
 
 	return nil, err
 }