diff --git a/raft/log.go b/raft/log.go
index b02ba12b3..4411acfe9 100644
--- a/raft/log.go
+++ b/raft/log.go
@@ -20,7 +20,7 @@ func newLog() *log {
 }
 
 func (l *log) maybeAppend(index, logTerm int, ents ...Entry) bool {
-	if l.isOk(index, logTerm) {
+	if l.matchTerm(index, logTerm) {
 		l.append(index, ents...)
 		return true
 	}
@@ -58,7 +58,7 @@ func (l *log) isUpToDate(i, term int) bool {
 	return term > e.Term || (term == e.Term && i >= l.len())
 }
 
-func (l *log) isOk(i, term int) bool {
+func (l *log) matchTerm(i, term int) bool {
 	if i > l.len() {
 		return false
 	}
diff --git a/raft/raft.go b/raft/raft.go
index 1875b42f0..030751323 100644
--- a/raft/raft.go
+++ b/raft/raft.go
@@ -132,10 +132,6 @@ func (sm *stateMachine) poll(addr int, v bool) (granted int) {
 	return granted
 }
 
-func (sm *stateMachine) isLogOk(i, term int) bool {
-	return sm.log.isOk(i, term)
-}
-
 // send persists state to stable storage and then sends to its mailbox
 func (sm *stateMachine) send(m Message) {
 	m.From = sm.addr
@@ -276,7 +272,7 @@ func (sm *stateMachine) Step(m Message) {
 	}
 
 	handleAppendEntries := func() {
-		if sm.isLogOk(m.Index, m.LogTerm) {
+		if sm.log.matchTerm(m.Index, m.LogTerm) {
 			sm.log.commit = m.Commit
 			sm.log.append(m.Index, m.Entries...)
 			sm.send(Message{To: m.From, Type: msgAppResp, Index: sm.li()})