diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index e58c3e5..fa193ff 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -39,6 +39,8 @@
 #include "psa/crypto.h"
 #include "mbedtls/psa_util.h"
 
+#if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) || \
+    defined(PSA_WANT_ALG_ECDH)
 /* Define a local translating function to save code size by not using too many
  * arguments in each translating place. */
 static int local_err_translation(psa_status_t status)
@@ -48,6 +50,7 @@
                                  psa_generic_status_to_mbedtls);
 }
 #define PSA_TO_MBEDTLS_ERR(status) local_err_translation(status)
+#endif
 
 const uint8_t mbedtls_ssl_tls13_hello_retry_request_magic[
     MBEDTLS_SERVER_HELLO_RANDOM_LEN] =