diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index e9487b28f..19efff7d9 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -1549,6 +1549,14 @@
  */
 //#define MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE
 
+/**
+ * \def MBEDTLS_SSL_TLS1_3_TICKET_NONCE_LENGTH
+ *
+ * Time in seconds of max ticket lifetime. This is not used in TLS 1.2.
+ *
+ */
+#define MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE 6000
+
 /**
  * \def MBEDTLS_SSL_TLS1_3_TICKET_NONCE_LENGTH
  *