diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index b07ff36..7bd3118 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -692,14 +692,16 @@
 
     } buffering;
 
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    unsigned int out_msg_seq;           /*!<  Outgoing handshake sequence number */
-    unsigned int in_msg_seq;            /*!<  Incoming handshake sequence number */
-
+#if defined(MBEDTLS_SSL_PROTO_DTLS) || defined(MBEDTLS_SSL_PROTO_TLS1_3)
     unsigned char *verify_cookie;       /*!<  Cli: HelloVerifyRequest cookie
                                               Srv: unused                    */
     unsigned char verify_cookie_len;    /*!<  Cli: cookie length
                                               Srv: flag for sending a cookie */
+#endif /* MBEDTLS_SSL_PROTO_DTLS || MBEDTLS_SSL_PROTO_TLS1_3 */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+    unsigned int out_msg_seq;           /*!<  Outgoing handshake sequence number */
+    unsigned int in_msg_seq;            /*!<  Incoming handshake sequence number */
 
     uint32_t retransmit_timeout;        /*!<  Current value of timeout       */
     mbedtls_ssl_flight_item *flight;    /*!<  Current outgoing flight        */