diff --git a/code/compiler/10/type.hpp b/code/compiler/10/type.hpp
index 1d387d3..94c4f85 100644
--- a/code/compiler/10/type.hpp
+++ b/code/compiler/10/type.hpp
@@ -1,6 +1,7 @@
 #pragma once
 #include <memory>
 #include <map>
+#include <string>
 #include <vector>
 #include <set>
 
diff --git a/code/compiler/10/type_env.hpp b/code/compiler/10/type_env.hpp
index 444e26b..ca91ef7 100644
--- a/code/compiler/10/type_env.hpp
+++ b/code/compiler/10/type_env.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include <map>
+#include <string>
 #include "type.hpp"
 
 struct type_env;