diff --git a/src/babylon/application_context.h b/src/babylon/application_context.h
index 21c734b9..ce61b8e3 100644
--- a/src/babylon/application_context.h
+++ b/src/babylon/application_context.h
@@ -14,6 +14,7 @@
 #include "boost/preprocessor/tuple/push_back.hpp"   // BOOST_PP_TUPLE_PUSH_BACK
 #include "boost/preprocessor/tuple/size.hpp"        // BOOST_PP_TUPLE_SIZE
 
+#include <atomic> // std::atomic
 #include <memory> // std::unique_ptr
 #include <mutex>  // std::recursive_mutex