diff --git a/mozilla/include/structs.h b/mozilla/include/structs.h
index 65edd514333..01aa980de57 100644
--- a/mozilla/include/structs.h
+++ b/mozilla/include/structs.h
@@ -334,6 +334,7 @@ struct MWContext_ {
     Bool anonymous;
 #ifdef MODULAR_NETLIB
     URL_Struct*   modular_data;
+    PRInt32       ref_count;
 #endif
 
     /* This gets set to `true' when layout encounters an image with no