diff --git a/src/data/dynamic_fwd.hpp b/src/data/dynamic_fwd.hpp
index ee5f552f..1a398edd 100644
--- a/src/data/dynamic_fwd.hpp
+++ b/src/data/dynamic_fwd.hpp
@@ -4,6 +4,7 @@
 #include "../typedefs.hpp"
 
 #include <memory>
+#include <string>
 #include <variant>
 
 namespace dynamic {