diff --git a/src/gnutls.c b/src/gnutls.c
index d363fea..981f127 100644
--- a/src/gnutls.c
+++ b/src/gnutls.c
@@ -776,7 +776,7 @@ one trustfile (usually a CA bundle).  */)
   gnutls_certificate_credentials_t x509_cred = NULL;
   gnutls_anon_client_credentials_t anon_cred = NULL;
   Lisp_Object global_init;
-  char const *priority_string_ptr = "NORMAL"; /* default priority string.  */
+  char const *priority_string_ptr = "@SYSTEM"; /* default priority string.  */
   unsigned int peer_verification;
   char* c_hostname;