diff --git a/test/async.cpp b/test/async.cpp
index a8fe09e43..79f3d7a5f 100644
--- a/test/async.cpp
+++ b/test/async.cpp
@@ -3,6 +3,7 @@
 #include <future>
 #include <mutex>
 #include <random>
+#include <thread>
 
 #include "test.h"