diff --git a/code/nel/include/nel/gui/libwww_types.h b/code/nel/include/nel/gui/libwww_types.h
index 4a1c6b238..01f6eb534 100644
--- a/code/nel/include/nel/gui/libwww_types.h
+++ b/code/nel/include/nel/gui/libwww_types.h
@@ -32,6 +32,8 @@
 #ifndef CL_LIB_WWW_TYPES_H
 #define CL_LIB_WWW_TYPES_H
 
+#include <string>
+
 //
 // LibWWW elements
 // - order must be kept for backward compatibility, new tags can be added to the end