diff --git a/lib/urldata.h b/lib/urldata.h
index abc9444998bd94ffaca70cbf110511d1fc96fbd2..3318b7f574aeecd949f2e5f5d755eb8767035e71 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -537,6 +537,7 @@ struct connectdata {
   struct ntlmdata ntlm;     /* NTLM differs from other authentication schemes
                                because it authenticates connections, not
                                single requests! */
+  struct ntlmdata proxyntlm; /* NTLM data for proxy */
 };
 
 /* The end of connectdata. */