diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 377d12b..900c63a 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -1180,7 +1180,7 @@
         return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
     }
 
-    p = buf + 4;
+    p = buf + 5;
     while( cert_type_len > 0 )
     {
         if( *p == SSL_CERT_TYPE_RSA_SIGN )