diff --git a/include/nlohmann/detail/view/materialize.hpp b/include/nlohmann/detail/view/materialize.hpp
index 4d1e7ab93..e9ffe0668 100644
--- a/include/nlohmann/detail/view/materialize.hpp
+++ b/include/nlohmann/detail/view/materialize.hpp
@@ -9,6 +9,7 @@
 #pragma once
 
 #include <cstdint> // int64_t, uint8_t
+#include <string> // string
 #include <vector> // vector
 
 #include <nlohmann/json.hpp>
diff --git a/single_include/nlohmann/json_view.hpp b/single_include/nlohmann/json_view.hpp
index 63856eca0..1b6fee52f 100644
--- a/single_include/nlohmann/json_view.hpp
+++ b/single_include/nlohmann/json_view.hpp
@@ -1769,6 +1769,7 @@ NLOHMANN_JSON_NAMESPACE_END
 
 
 #include <cstdint> // int64_t, uint8_t
+#include <string> // string
 #include <vector> // vector
 
 // #include <nlohmann/json.hpp>