diff --git a/include/leveldb/env.h b/include/leveldb/env.h
index 60ab6d6..2d8d918 100755
--- a/include/leveldb/env.h
+++ b/include/leveldb/env.h
@@ -17,7 +17,7 @@
 #include <cstdint>
 #include <string>
 #include <vector>
-
+#include <chrono>
 #include "leveldb/export.h"
 #include "leveldb/status.h"