diff --git a/src/accessorinterface.h b/src/accessorinterface.h
index 8cc8165..fe51418 100644
--- a/src/accessorinterface.h
+++ b/src/accessorinterface.h
@@ -1,5 +1,8 @@
 #pragma once
 
+// system includes
+#include <string>
+
 // 3rdparty lib includes
 #include <tl/expected.hpp>