diff --git a/mozilla/include/structs.h b/mozilla/include/structs.h
index e32a3af4701..0e4dc6f1cb7 100644
--- a/mozilla/include/structs.h
+++ b/mozilla/include/structs.h
@@ -331,6 +331,9 @@ struct MWContext_ {
     void *ncast_channel_context;
   /* if the window is displaying an XML file, keep a pointer to the XML file structure here */
     void*   xmlfile;
+#ifdef MODULAR_NETLIB
+    URL_Struct*   modular_data;
+#endif
 };