diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 8c3da49..b9801a0 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -2113,10 +2113,10 @@
 
 #if defined(MBEDTLS_SSL_EARLY_DATA)
 int mbedtls_ssl_tls13_write_early_data_ext(mbedtls_ssl_context *ssl,
+                                           int in_new_session_ticket,
                                            unsigned char *buf,
                                            const unsigned char *end,
-                                           size_t *out_len,
-                                           const mbedtls_ssl_session *session);
+                                           size_t *out_len);
 
 #if defined(MBEDTLS_SSL_SRV_C)
 #define MBEDTLS_SSL_EARLY_DATA_STATUS_NOT_RECEIVED \
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index fa6c4c6..ae11364 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -1176,7 +1176,7 @@
         ssl->conf->early_data_enabled == MBEDTLS_SSL_EARLY_DATA_ENABLED) {
 
         ret = mbedtls_ssl_tls13_write_early_data_ext(
-            ssl, p, end, &ext_len, NULL);
+            ssl, 0, p, end, &ext_len);
         if (ret != 0) {
             return ret;
         }
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index f711e97..fe2a2eb 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -1410,18 +1410,18 @@
  */
 #if defined(MBEDTLS_SSL_EARLY_DATA)
 int mbedtls_ssl_tls13_write_early_data_ext(mbedtls_ssl_context *ssl,
+                                           int in_new_session_ticket,
                                            unsigned char *buf,
                                            const unsigned char *end,
-                                           size_t *out_len,
-                                           const mbedtls_ssl_session *session)
+                                           size_t *out_len)
 {
     unsigned char *p = buf;
 
 #if defined(MBEDTLS_SSL_SRV_C)
-    const size_t needed = session != NULL ? 8 : 4;
+    const size_t needed = in_new_session_ticket ? 8 : 4;
 #else
     const size_t needed = 4;
-    ((void) session);
+    ((void) in_new_session_ticket);
 #endif
 
     *out_len = 0;
@@ -1432,11 +1432,11 @@
     MBEDTLS_PUT_UINT16_BE(needed - 4, p, 2);
 
 #if defined(MBEDTLS_SSL_SRV_C)
-    if (session != NULL) {
-        MBEDTLS_PUT_UINT32_BE(session->max_early_data_size, p, 4);
+    if (in_new_session_ticket) {
+        MBEDTLS_PUT_UINT32_BE(ssl->conf->max_early_data_size, p, 4);
         MBEDTLS_SSL_DEBUG_MSG(
             4, ("Sent max_early_data_size=%u",
-                (unsigned int) session->max_early_data_size));
+                (unsigned int) ssl->conf->max_early_data_size));
     }
 #endif
 
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 6c49f8d..39caa9b 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -2525,7 +2525,7 @@
 #if defined(MBEDTLS_SSL_EARLY_DATA)
     if (ssl->early_data_status == MBEDTLS_SSL_EARLY_DATA_STATUS_ACCEPTED) {
         ret = mbedtls_ssl_tls13_write_early_data_ext(
-            ssl, p, end, &output_len, NULL);
+            ssl, 0, p, end, &output_len);
         if (ret != 0) {
             return ret;
         }
@@ -3326,7 +3326,7 @@
     if (ssl->conf->early_data_enabled == MBEDTLS_SSL_EARLY_DATA_ENABLED &&
         ssl->conf->max_early_data_size > 0) {
         if ((ret = mbedtls_ssl_tls13_write_early_data_ext(
-                 ssl, p, end, &output_len, session)) != 0) {
+                 ssl, 1, p, end, &output_len)) != 0) {
             MBEDTLS_SSL_DEBUG_RET(
                 1, "mbedtls_ssl_tls13_write_early_data_ext", ret);
             return ret;