diff --git a/include/matador/object/object_proxy.hpp b/include/matador/object/object_proxy.hpp
index d9ca1c5..633759e 100644
--- a/include/matador/object/object_proxy.hpp
+++ b/include/matador/object/object_proxy.hpp
@@ -5,6 +5,7 @@
 
 #include "matador/object/object_resolver.hpp"
 
+#include <atomic>
 #include <memory>
 #include <utility>
 #include <stdexcept>