diff --git a/db/version_builder.cc b/db/version_builder.cc
index 49aa6ebfe64ff3ada276f6cffe57c31f0f679163..00972d4e59062e5992e86dc4ddfb37a4b6140e41 100644
--- a/db/version_builder.cc
+++ b/db/version_builder.cc
@@ -66,6 +66,8 @@ class VersionBuilder::Rep {
     enum SortMethod { kLevel0 = 0, kLevelNon0 = 1, } sort_method;
     const InternalKeyComparator* internal_comparator;
 
+    FileComparator() : internal_comparator(nullptr) {}
+
     bool operator()(FileMetaData* f1, FileMetaData* f2) const {
       switch (sort_method) {
         case kLevel0:
diff --git a/db/version_edit.h b/db/version_edit.h
index 47ebf5b1c76dc7d30e832ed22b26b36289e55c65..391e6143414dff9471d04d8aa61c7e92b4f19d73 100644
--- a/db/version_edit.h
+++ b/db/version_edit.h
@@ -144,6 +144,7 @@ struct FdWithKeyRange {
 
   FdWithKeyRange()
       : fd(),
+        file_metadata(nullptr),
         smallest_key(),
         largest_key() {
   }
diff --git a/db/version_set.cc b/db/version_set.cc
index b2b1dc4381473132fdca60b8d2a56b0d46ccf66a..401afdd8479292a7838d60b9766d75c00694eca6 100644
--- a/db/version_set.cc
+++ b/db/version_set.cc
@@ -102,6 +102,7 @@ class FilePicker {
 #endif
         level_files_brief_(file_levels),
         is_hit_file_last_in_level_(false),
+        curr_file_level_(nullptr),
         user_key_(user_key),
         ikey_(ikey),
         file_indexer_(file_indexer),
@@ -2402,6 +2403,7 @@ VersionSet::VersionSet(const std::string& dbname,
       db_options_(db_options),
       next_file_number_(2),
       manifest_file_number_(0),  // Filled by Recover()
+      options_file_number_(0),
       pending_manifest_file_number_(0),
       last_sequence_(0),
       last_allocated_sequence_(0),
diff --git a/db/write_batch.cc b/db/write_batch.cc
index e4c05eeae4632c28b38e1a200f5e8c1d16021a53..521e5346740922dc37baa09c5802884c24730181 100644
--- a/db/write_batch.cc
+++ b/db/write_batch.cc
@@ -968,6 +968,7 @@ class MemTableInserter : public WriteBatch::Handler {
         post_info_created_(false),
         has_valid_writes_(has_valid_writes),
         rebuilding_trx_(nullptr),
+        rebuilding_trx_seq_(0),
         seq_per_batch_(seq_per_batch),
         // Write after commit currently uses one seq per key (instead of per
         // batch). So seq_per_batch being false indicates write_after_commit