--- ./src/tcp-server-tls.c	2016-09-15 08:49:20.172000884 +0200
+++ ./src/tcp-server-tls.c2	2017-02-07 01:10:30.904772287 +0100
@@ -489,7 +489,7 @@
 #else
 # define TLS_DH_STR "+ANON-DH"
 #endif
-        const char *pstring = "NORMAL:" TLS_DH_STR;
+        const char *pstring = "@SYSTEM:" TLS_DH_STR;
 
         gnutls_set_default_priority(session);