diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 9fcb2b2..01420dd 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -509,6 +509,11 @@
     uint8_t sni_authmode;               /*!< authmode from SNI callback     */
 #endif
 
+#if defined(MBEDTLS_SSL_SRV_C)
+    /** cert_request_send to indicate whether client certitifacte request */
+    uint16_t cert_request_send;
+#endif /* MBEDTLS_SSL_SRV_C */
+
 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
     uint8_t new_session_ticket;         /*!< use NewSessionTicket?    */
 #endif /* MBEDTLS_SSL_SESSION_TICKETS */