diff --git a/pkg/backend.go b/pkg/backend.go
index a634e73..c24c018 100644
--- a/pkg/backend.go
+++ b/pkg/backend.go
@@ -97,16 +97,12 @@ func (s *LevelDBBackend) ModifyAncients(f func(ethdb.AncientWriteOp) error) (int
 	return 0, errWriteNotAllowed
 }
 
-func (s *LevelDBBackend) TruncateAncients(n uint64) error {
-	return errWriteNotAllowed
+func (s *LevelDBBackend) TruncateHead(n uint64) (uint64, error) {
+	return 0, errWriteNotAllowed
 }
 
-func (s *LevelDBBackend) TruncateHead(n uint64) error {
-	return errWriteNotAllowed
-}
-
-func (s *LevelDBBackend) TruncateTail(n uint64) error {
-	return errWriteNotAllowed
+func (s *LevelDBBackend) TruncateTail(n uint64) (uint64, error) {
+	return 0, errWriteNotAllowed
 }
 
 func (s *LevelDBBackend) Sync() error {
diff --git a/pkg/client/database.go b/pkg/client/database.go
index f75e52c..7ddb7c9 100644
--- a/pkg/client/database.go
+++ b/pkg/client/database.go
@@ -212,14 +212,14 @@ func (d *DatabaseClient) ModifyAncients(f func(ethdb.AncientWriteOp) error) (int
 
 // TruncateHead satisfies the ethdb.AncientWriter interface.
 // TruncateHead discards all but the first n ancient data from the ancient store.
-func (d *DatabaseClient) TruncateHead(n uint64) error {
-	return errNotSupported
+func (d *DatabaseClient) TruncateHead(n uint64) (uint64, error) {
+	return 0, errNotSupported
 }
 
 // TruncateTail satisfies the ethdb.AncientWriter interface.
 // TruncateTail discards the first n ancient data from the ancient store.
-func (d *DatabaseClient) TruncateTail(n uint64) error {
-	return errNotSupported
+func (d *DatabaseClient) TruncateTail(n uint64) (uint64, error) {
+	return 0, errNotSupported
 }
 
 // Sync satisfies the ethdb.AncientWriter interface