diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 2ff0964..555ed73 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -630,7 +630,7 @@
 
     SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
 
-    if( ssl->client_auth == 0 )
+    if( ssl->client_auth == 0 || ssl->own_cert == NULL )
     {
         SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
         ssl->state++;