diff --git a/db/column_family.h b/db/column_family.h
index 256b66dac05..d7e6c24ae5c 100644
--- a/db/column_family.h
+++ b/db/column_family.h
@@ -77,7 +77,7 @@ class ColumnFamilyHandleImpl : public ColumnFamilyHandle {
 class ColumnFamilyHandleInternal : public ColumnFamilyHandleImpl {
  public:
   ColumnFamilyHandleInternal()
-      : ColumnFamilyHandleImpl(nullptr, nullptr, nullptr) {}
+      : ColumnFamilyHandleImpl(nullptr, nullptr, nullptr), internal_cfd_(nullptr) {}
 
   void SetCFD(ColumnFamilyData* _cfd) { internal_cfd_ = _cfd; }
   virtual ColumnFamilyData* cfd() const override { return internal_cfd_; }
diff --git a/db/compacted_db_impl.cc b/db/compacted_db_impl.cc
index 7cff496f277..8f44b08b87c 100644
--- a/db/compacted_db_impl.cc
+++ b/db/compacted_db_impl.cc
@@ -17,7 +17,8 @@ extern bool SaveValue(void* arg, const ParsedInternalKey& parsed_key,
 
 CompactedDBImpl::CompactedDBImpl(
   const DBOptions& options, const std::string& dbname)
-  : DBImpl(options, dbname) {
+  : DBImpl(options, dbname), cfd_(nullptr), version_(nullptr),
+    user_comparator_(nullptr) {
 }
 
 CompactedDBImpl::~CompactedDBImpl() {
diff --git a/db/compaction_iterator.cc b/db/compaction_iterator.cc
index 6de962ab4b8..312df2c61c8 100644
--- a/db/compaction_iterator.cc
+++ b/db/compaction_iterator.cc
@@ -80,7 +80,10 @@ CompactionIterator::CompactionIterator(
 #endif  // ROCKSDB_LITE
       shutting_down_(shutting_down),
       ignore_snapshots_(false),
-      merge_out_iter_(merge_helper_) {
+      current_user_key_sequence_(0),
+      current_user_key_snapshot_(0),
+      merge_out_iter_(merge_helper_),
+      current_key_committed_(false) {
   assert(compaction_filter_ == nullptr || compaction_ != nullptr);
   bottommost_level_ =
       compaction_ == nullptr ? false : compaction_->bottommost_level();