diff --git a/db/db_bench.cc b/db/db_bench.cc
index f9403f4..41e903b 100644
--- a/db/db_bench.cc
+++ b/db/db_bench.cc
@@ -304,10 +304,7 @@ struct ThreadState {
   Stats stats;
   SharedState* shared;
 
-  ThreadState(int index)
-      : tid(index),
-        rand(1000 + index) {
-  }
+  ThreadState(int index) : tid(index), rand(1000 + index), shared(nullptr) {}
 };
 
 }  // namespace
diff --git a/db/db_impl.cc b/db/db_impl.cc
index 3468862..caef2b1 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -48,7 +48,8 @@ struct DBImpl::Writer {
   bool done;
   port::CondVar cv;
 
-  explicit Writer(port::Mutex* mu) : cv(mu) { }
+  explicit Writer(port::Mutex* mu)
+      : batch(nullptr), sync(false), done(false), cv(mu) {}
 };
 
 struct DBImpl::CompactionState {
@@ -78,10 +79,10 @@ struct DBImpl::CompactionState {
 
   explicit CompactionState(Compaction* c)
       : compaction(c),
+        smallest_snapshot(0),
         outfile(nullptr),
         builder(nullptr),
-        total_bytes(0) {
-  }
+        total_bytes(0) {}
 };
 
 // Fix user-supplied options to be reasonable
diff --git a/util/cache.cc b/util/cache.cc
index 7cc2cea..25b51b5 100644
--- a/util/cache.cc
+++ b/util/cache.cc
@@ -196,8 +196,7 @@ class LRUCache {
   HandleTable table_ GUARDED_BY(mutex_);
 };
 
-LRUCache::LRUCache()
-    : usage_(0) {
+LRUCache::LRUCache() : capacity_(0), usage_(0) {
   // Make empty circular linked lists.
   lru_.next = &lru_;
   lru_.prev = &lru_;