diff --git a/db/db_bench.cc b/db/db_bench.cc
index 1a379e948..fcc930e67 100644
--- a/db/db_bench.cc
+++ b/db/db_bench.cc
@@ -1533,7 +1533,7 @@ class Benchmark {
 
   void AcquireLoad(ThreadState* thread) {
     int dummy;
-    std::atomic<void*> ap;
+    std::atomic<void*> ap(&dummy);
     int count = 0;
     void *ptr = nullptr;
     thread->stats.AddMessage("(each op is 1000 loads)");
diff --git a/util/env_test.cc b/util/env_test.cc
index be542e9af..3d7a9a4db 100644
--- a/util/env_test.cc
+++ b/util/env_test.cc
@@ -11,6 +11,7 @@
 
 #include <iostream>
 #include <unordered_set>
+#include <atomic>
 
 #ifdef OS_LINUX
 #include <sys/stat.h>