diff --git a/keystore/keystore.go b/keystore/keystore.go
index e76136b..c558054 100644
--- a/keystore/keystore.go
+++ b/keystore/keystore.go
@@ -706,6 +706,7 @@ func (s *Store) ReadFrom(r io.Reader) (n int64, err error) {
 	rootAddr := s.keyGenerator.Address()
 	s.addrMap[getAddressKey(rootAddr)] = &s.keyGenerator
 	s.chainIdxMap[rootKeyChainIdx] = rootAddr
+	s.lastChainIdx = rootKeyChainIdx
 
 	// Fill unserializied fields.
 	wts := appendedEntries.entries