diff --git a/lib/http_negotiate.h b/lib/http_negotiate.h
index 09141bda7..36a346c56 100644
--- a/lib/http_negotiate.h
+++ b/lib/http_negotiate.h
@@ -27,7 +27,7 @@
 #ifdef GSSAPI
 
 /* this is for Negotiate header input */
-CURLcode Curl_input_negotiate(struct connectdata *conn, char *header);
+int Curl_input_negotiate(struct connectdata *conn, char *header);
 
 /* this is for creating Negotiate header output */
 CURLcode Curl_output_negotiate(struct connectdata *conn);