diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index d276a95..0372f2d 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -2541,6 +2541,7 @@
 
         switch( extension_type )
         {
+#if defined(MBEDTLS_SSL_EARLY_DATA)
             case MBEDTLS_TLS_EXT_EARLY_DATA:
                 if( extension_data_len != 4 )
                 {
@@ -2555,6 +2556,7 @@
                             MBEDTLS_SSL_TLS1_3_TICKET_ALLOW_EARLY_DATA;
                 }
                 break;
+#endif /* MBEDTLS_SSL_EARLY_DATA */
 
             default:
                 MBEDTLS_SSL_PRINT_EXT(