diff --git a/core/rawdb/freezer.go b/core/rawdb/freezer.go
index 0cdec03a5b..b7824ddc0d 100644
--- a/core/rawdb/freezer.go
+++ b/core/rawdb/freezer.go
@@ -108,11 +108,9 @@ func NewFreezer(datadir string, namespace string, readonly bool, maxTableSize ui
 	// Leveldb uses LOCK as the filelock filename. To prevent the
 	// name collision, we use FLOCK as the lock name.
 	lock := flock.New(flockFile)
-	tryLock := func() (bool, error) {
-		if readonly {
-			return lock.TryRLock()
-		}
-		return lock.TryLock()
+	tryLock := lock.TryLock
+	if readonly {
+		tryLock = lock.TryRLock
 	}
 	if locked, err := tryLock(); err != nil {
 		return nil, err