diff --git a/rai/utility.hpp b/rai/utility.hpp
index 8a9932d3..334ad7dd 100644
--- a/rai/utility.hpp
+++ b/rai/utility.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <array>
+#include <atomic>
 #include <condition_variable>
 #include <type_traits>