diff --git a/lib/urldata.h b/lib/urldata.h
index a9a5d7f48..196c45f16 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -173,6 +173,7 @@ struct digestdata {
   char *cnonce;
   char *realm;
   int algo;
+  bool stale; /* set true for re-negotiation */
 };
 
 typedef enum {