diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 1c60ec8e4..37793a791 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -1541,6 +1541,15 @@
  */
 //#define MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE
 
+/**
+ * \def MBEDTLS_SSL_TICKET_NONCE_LENGTH
+ *
+ * Size in bytes of a ticket nonce. This is not used in TLS 1.2.
+ *
+ * The default value is 32 bytes.
+ */
+#define MBEDTLS_SSL_TICKET_NONCE_LENGTH 32
+
 /**
  * \def MBEDTLS_SSL_PROTO_DTLS
  *