diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index 04be34d..3b37867 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -146,6 +146,7 @@
 #define POLARSSL_ERR_SSL_INTERNAL_ERROR                    -0x6C00  /**< Internal error (eg, unexpected failure in lower-level module) */
 #define POLARSSL_ERR_SSL_COUNTER_WRAPPING                  -0x6B80  /**< A counter would wrap (eg, too many messages exchanged). */
 #define POLARSSL_ERR_SSL_WAITING_SERVER_HELLO_RENEGO       -0x6B00  /**< Unexpected message at ServerHello in renegotiation. */
+#define POLARSSL_ERR_SSL_HELLO_VERIFY_REQUIRED             -0x6A80  /**< DTLS client must retry for hello verification */
 
 /*
  * Various constants