diff --git a/host/contracts/contracts.go b/host/contracts/contracts.go
index 209baca8..6c5cce9a 100644
--- a/host/contracts/contracts.go
+++ b/host/contracts/contracts.go
@@ -148,10 +148,10 @@ type (
 		once       sync.Once
 		done       func() // done is called when the updater is closed.
 
-		sectors       uint64
 		contractID    types.FileContractID
 		sectorActions []SectorChange
 		sectorRoots   []types.Hash256
+		oldRoots      []types.Hash256
 	}
 )
 
@@ -331,7 +331,7 @@ func (cu *ContractUpdater) Commit(revision SignedRevision, usage Usage) error {
 
 	start := time.Now()
 	// revise the contract
-	err := cu.store.ReviseContract(revision, usage, cu.sectorActions)
+	err := cu.store.ReviseContract(revision, cu.oldRoots, usage, cu.sectorActions)
 	if err == nil {
 		// clear the committed sector actions
 		cu.sectorActions = cu.sectorActions[:0]
diff --git a/host/contracts/manager.go b/host/contracts/manager.go
index 5a8ef635..8b79d747 100644
--- a/host/contracts/manager.go
+++ b/host/contracts/manager.go
@@ -466,8 +466,8 @@ func (cm *ContractManager) ReviseContract(contractID types.FileContractID) (*Con
 
 		rootsCache:  cm.rootsCache,
 		contractID:  contractID,
-		sectors:     uint64(len(roots)),
-		sectorRoots: roots,
+		sectorRoots: roots, // roots is already a deep copy
+		oldRoots:    append([]types.Hash256(nil), roots...),
 
 		done: done, // decrements the threadgroup counter after the updater is closed
 	}, nil
diff --git a/host/contracts/manager_test.go b/host/contracts/manager_test.go
index 890006b7..4abc3ef3 100644
--- a/host/contracts/manager_test.go
+++ b/host/contracts/manager_test.go
@@ -1013,7 +1013,7 @@ func TestSectorRoots(t *testing.T) {
 		defer release()
 
 		// use the database method directly to avoid the sector cache
-		err = db.ReviseContract(rev, contracts.Usage{}, []contracts.SectorChange{
+		err = db.ReviseContract(rev, roots, contracts.Usage{}, []contracts.SectorChange{
 			{Action: contracts.SectorActionAppend, Root: root},
 		})
 		if err != nil {
diff --git a/host/contracts/persist.go b/host/contracts/persist.go
index 13c2429a..e8bda305 100644
--- a/host/contracts/persist.go
+++ b/host/contracts/persist.go
@@ -48,7 +48,7 @@ type (
 		ContractAction(height uint64, contractFn func(types.FileContractID, uint64, string)) error
 		// ReviseContract atomically updates a contract and its associated
 		// sector roots.
-		ReviseContract(revision SignedRevision, usage Usage, sectorChanges []SectorChange) error
+		ReviseContract(revision SignedRevision, oldRoots []types.Hash256, usage Usage, sectorChanges []SectorChange) error
 		// UpdateContractState atomically updates the contract manager's state.
 		UpdateContractState(modules.ConsensusChangeID, uint64, func(UpdateStateTransaction) error) error
 		// ExpireContractSectors removes sector roots for any contracts that are
diff --git a/persist/sqlite/contracts.go b/persist/sqlite/contracts.go
index 0cdbdeb5..802088ac 100644
--- a/persist/sqlite/contracts.go
+++ b/persist/sqlite/contracts.go
@@ -259,17 +259,8 @@ func (s *Store) RenewContract(renewal contracts.SignedRevision, clearing contrac
 	})
 }
 
-func contractSectorRoots(tx txn, contractID int64) (uint64, error) {
-	var index uint64
-	err := tx.QueryRow(`SELECT COUNT(*) FROM contract_sector_roots WHERE contract_id=$1`, contractID).Scan(&index)
-	if errors.Is(err, sql.ErrNoRows) {
-		return 0, nil
-	}
-	return index, err
-}
-
 // ReviseContract atomically updates a contract's revision and sectors
-func (s *Store) ReviseContract(revision contracts.SignedRevision, usage contracts.Usage, sectorChanges []contracts.SectorChange) error {
+func (s *Store) ReviseContract(revision contracts.SignedRevision, oldRoots []types.Hash256, usage contracts.Usage, sectorChanges []contracts.SectorChange) error {
 	return s.transaction(func(tx txn) error {
 		// revise the contract
 		contractID, err := reviseContract(tx, revision)
@@ -286,11 +277,7 @@ func (s *Store) ReviseContract(revision contracts.SignedRevision, usage contract
 		}
 
 		// update the sector roots
-		sectors, err := contractSectorRoots(tx, contractID)
-		if err != nil {
-			return fmt.Errorf("failed to get sector index: %w", err)
-		}
-
+		sectors := uint64(len(oldRoots))
 		for _, change := range sectorChanges {
 			switch change.Action {
 			case contracts.SectorActionAppend:
diff --git a/persist/sqlite/contracts_test.go b/persist/sqlite/contracts_test.go
index dee660ab..dcc5ceaf 100644
--- a/persist/sqlite/contracts_test.go
+++ b/persist/sqlite/contracts_test.go
@@ -37,7 +37,7 @@ func rootsEqual(a, b []types.Hash256) error {
 	return nil
 }
 
-func runRevision(db *Store, revision contracts.SignedRevision, changes []contracts.SectorChange) error {
+func runRevision(db *Store, revision contracts.SignedRevision, roots []types.Hash256, changes []contracts.SectorChange) error {
 	for _, change := range changes {
 		switch change.Action {
 		// store a sector in the database for the append or update actions
@@ -52,7 +52,7 @@ func runRevision(db *Store, revision contracts.SignedRevision, changes []contrac
 		}
 	}
 
-	return db.ReviseContract(revision, contracts.Usage{}, changes)
+	return db.ReviseContract(revision, roots, contracts.Usage{}, changes)
 }
 
 func TestReviseContract(t *testing.T) {
@@ -261,6 +261,7 @@ func TestReviseContract(t *testing.T) {
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
+			oldRoots := append([]types.Hash256(nil), roots...)
 			// update the expected roots
 			for i, change := range test.changes {
 				switch change.Action {
@@ -301,7 +302,7 @@ func TestReviseContract(t *testing.T) {
 				}
 			}
 
-			if err := runRevision(db, contract, test.changes); err != nil {
+			if err := runRevision(db, contract, oldRoots, test.changes); err != nil {
 				if test.errors {
 					t.Log("received error:", err)
 					return
diff --git a/persist/sqlite/volumes_test.go b/persist/sqlite/volumes_test.go
index 005231e5..382ef9e8 100644
--- a/persist/sqlite/volumes_test.go
+++ b/persist/sqlite/volumes_test.go
@@ -652,7 +652,7 @@ func TestPrune(t *testing.T) {
 			Action: contracts.SectorActionAppend,
 		})
 	}
-	err = db.ReviseContract(c, contracts.Usage{}, changes)
+	err = db.ReviseContract(c, []types.Hash256{}, contracts.Usage{}, changes)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -776,11 +776,12 @@ func TestPrune(t *testing.T) {
 	changes = []contracts.SectorChange{
 		{Action: contracts.SectorActionTrim, A: uint64(len(contractSectors) / 2)},
 	}
-	if err := db.ReviseContract(c, contracts.Usage{}, changes); err != nil {
+	if err := db.ReviseContract(c, contractSectors, contracts.Usage{}, changes); err != nil {
 		t.Fatal(err)
 	}
+	contractSectors = contractSectors[:len(contractSectors)/2]
 
-	if err := checkConsistency(contractSectors[:len(contractSectors)/2], nil, nil, roots[50:]); err != nil {
+	if err := checkConsistency(contractSectors, nil, nil, roots[50:]); err != nil {
 		t.Fatal(err)
 	}