diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 901c104..d454ebb 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -77,6 +77,10 @@
 /* Faked handshake message identity for HelloRetryRequest. */
 #define MBEDTLS_SSL_TLS1_3_HS_HELLO_RETRY_REQUEST ( -MBEDTLS_SSL_HS_SERVER_HELLO )
 
+/* Early data indication sent or not */
+#define MBEDTLS_SSL_EARLY_DATA_OFF        0
+#define MBEDTLS_SSL_EARLY_DATA_ON         1
+
 /*
  * Internal identity of handshake extensions
  */