diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 15656fe..d527959 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -761,6 +761,9 @@
     else
     if( ssl_tls13_check_ephemeral_key_exchange( ssl ) )
     {
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+        mbedtls_ssl_remove_psk( ssl );
+#endif
         ssl->handshake->key_exchange_mode =
             MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL;
         MBEDTLS_SSL_DEBUG_MSG( 2, ( "key exchange mode: ephemeral" ) );