diff --git a/src/citymania/cm_settings.hpp b/src/citymania/cm_settings.hpp
index 9f0231a4d8..1b118a86d8 100644
--- a/src/citymania/cm_settings.hpp
+++ b/src/citymania/cm_settings.hpp
@@ -3,6 +3,7 @@
 
 #include <memory>
 #include <vector>
+#include <string>
 
 #include "../cargo_type.h"