diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index d610052..1904ac9 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -139,6 +139,7 @@
 #define POLARSSL_ERR_SSL_PK_TYPE_MISMATCH                  -0x6D00  /**< Public key type mismatch (eg, asked for RSA key exchange and presented EC key) */
 #define POLARSSL_ERR_SSL_UNKNOWN_IDENTITY                  -0x6C80  /**< Unkown identity received (eg, PSK identity) */
 #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). */
 
 /*
  * Various constants