diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 41bb9c5..c02ff58 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -243,6 +243,9 @@
 /* Maximum size in bytes of list in supported elliptic curve ext., RFC 4492 */
 #define MBEDTLS_SSL_MAX_CURVE_LIST_LEN         65535
 
+/* Maximum amount of early data to buffer on the server. */
+#define MBEDTLS_SSL_MAX_EARLY_DATA             1024
+
 #define MBEDTLS_RECEIVED_SIG_ALGS_SIZE         20
 
 #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)