diff --git a/db/db_test_util.h b/db/db_test_util.h
index 4b5bc48450d..f58b18e4ac0 100644
--- a/db/db_test_util.h
+++ b/db/db_test_util.h
@@ -282,7 +282,9 @@ class SpecialEnv : public EnvWrapper {
           : env_(env), base_(std::move(b)) {
         env_->num_open_wal_file_.fetch_add(1);
       }
-      virtual ~SpecialWalFile() { env_->num_open_wal_file_.fetch_add(-1); }
+      virtual ~SpecialWalFile() override {
+        env_->num_open_wal_file_.fetch_add(-1);
+      }
       Status Append(const Slice& data) override {
 #if !(defined NDEBUG) || !defined(OS_WIN)
         TEST_SYNC_POINT("SpecialEnv::SpecialWalFile::Append:1");
@@ -594,7 +596,7 @@ class SpecialEnv : public EnvWrapper {
       class NoopDirectory : public Directory {
        public:
         NoopDirectory() {}
-        ~NoopDirectory() {}
+        ~NoopDirectory() override {}
 
         Status Fsync() override { return Status::OK(); }
         Status Close() override { return Status::OK(); }
@@ -1098,7 +1100,7 @@ class DBTestBase : public testing::Test {
   // tests, but won't cover the exact fsync logic.
   DBTestBase(const std::string path, bool env_do_fsync);
 
-  ~DBTestBase();
+  ~DBTestBase() override;
 
   static std::string Key(int i) {
     char buf[100];
diff --git a/table/mock_table.h b/table/mock_table.h
index af3a4eb46cd..ccab4afec3a 100644
--- a/table/mock_table.h
+++ b/table/mock_table.h
@@ -135,7 +135,7 @@ class MockTableReader : public TableReader {
     return std::make_shared<const TableProperties>(tp_);
   }
 
-  ~MockTableReader() = default;
+  ~MockTableReader() override = default;
 
  private:
   const KVVector& table_;
diff --git a/test_util/testutil.h b/test_util/testutil.h
index 2d693b5f201..88420ca67fe 100644
--- a/test_util/testutil.h
+++ b/test_util/testutil.h
@@ -84,7 +84,7 @@ class PlainInternalKeyComparator : public InternalKeyComparator {
   explicit PlainInternalKeyComparator(const Comparator* c)
       : InternalKeyComparator(c) {}
 
-  virtual ~PlainInternalKeyComparator() {}
+  virtual ~PlainInternalKeyComparator() override {}
 
   int Compare(const Slice& a, const Slice& b) const override {
     return user_comparator()->Compare(a, b);
@@ -310,7 +310,7 @@ class StringSource : public FSRandomAccessFile {
         mmap_(mmap),
         total_reads_(0) {}
 
-  virtual ~StringSource() {}
+  virtual ~StringSource() override {}
 
   uint64_t Size() const { return contents_.size(); }
 
@@ -744,7 +744,7 @@ class ChanglingMergeOperator : public MergeOperator {
  public:
   explicit ChanglingMergeOperator(const std::string& name)
       : name_(name + "MergeOperator") {}
-  ~ChanglingMergeOperator() {}
+  ~ChanglingMergeOperator() override {}
 
   void SetName(const std::string& name) { name_ = name; }
 
@@ -783,7 +783,7 @@ class ChanglingCompactionFilter : public CompactionFilter {
  public:
   explicit ChanglingCompactionFilter(const std::string& name)
       : name_(name + "CompactionFilter") {}
-  ~ChanglingCompactionFilter() {}
+  ~ChanglingCompactionFilter() override {}
 
   void SetName(const std::string& name) { name_ = name; }
 
@@ -819,7 +819,7 @@ class ChanglingCompactionFilterFactory : public CompactionFilterFactory {
  public:
   explicit ChanglingCompactionFilterFactory(const std::string& name)
       : name_(name + "CompactionFilterFactory") {}
-  ~ChanglingCompactionFilterFactory() {}
+  ~ChanglingCompactionFilterFactory() override {}
 
   void SetName(const std::string& name) { name_ = name; }