diff --git a/tools/ldb_cmd.cc b/tools/ldb_cmd.cc
index 3725cf3ba..ef101757f 100644
--- a/tools/ldb_cmd.cc
+++ b/tools/ldb_cmd.cc
@@ -1191,7 +1191,7 @@ void ManifestDumpCommand::DoCommand() {
       exec_state_ = LDBCommandExecuteResult::Failed(err_msg);
       return;
     }
-    if (db_path_[db_path_.length() - 1] != '/') {
+    if (db_path_.back() != '/') {
       db_path_.append("/");
     }
     manifestfile = db_path_ + matched_file;
diff --git a/tools/ldb_cmd_test.cc b/tools/ldb_cmd_test.cc
index 3bc6ea980..c0e412789 100644
--- a/tools/ldb_cmd_test.cc
+++ b/tools/ldb_cmd_test.cc
@@ -187,7 +187,7 @@ class FileChecksumTestHelper {
   Status VerifyChecksumInManifest(
       const std::vector<LiveFileMetaData>& live_files) {
     // Step 1: verify if the dbname_ is correct
-    if (dbname_[dbname_.length() - 1] != '/') {
+    if (dbname_.back() != '/') {
       dbname_.append("/");
     }