diff --git a/library/psa_crypto_ecp.c b/library/psa_crypto_ecp.c
index 9cce3af..75ab169 100644
--- a/library/psa_crypto_ecp.c
+++ b/library/psa_crypto_ecp.c
@@ -401,7 +401,7 @@
                              mbedtls_psa_get_random,
                              MBEDTLS_PSA_RANDOM_STATE ) );
 #else
-       ret = MBEDTLS_ERR_ECP_INVALID_KEY;
+       ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
        goto cleanup;
 #endif /* defined(BUILTIN_ALG_DETERMINISTIC_ECDSA) */
     }