diff --git a/src/object/interface/programmable_object.h b/src/object/interface/programmable_object.h
index 63c339e0..30b2f417 100644
--- a/src/object/interface/programmable_object.h
+++ b/src/object/interface/programmable_object.h
@@ -22,6 +22,7 @@
 #include "object/object_interface_type.h"
 
 #include <memory>
+#include <string>
 #include <vector>
 
 class CScript;