diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 46fb92464d..7eb181e373 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -7004,7 +7004,7 @@ static int ssl_parse_certificate_chain(mbedtls_ssl_context *ssl,
 #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
         switch (ret) {
             case 0: /*ok*/
-            case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND:
+            case MBEDTLS_ERR_OID_NOT_FOUND:
                 /* Ignore certificate with an unknown algorithm: maybe a
                    prior certificate was already trusted. */
                 break;
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 6a7d502723..1076dea393 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -518,7 +518,7 @@ int mbedtls_ssl_tls13_parse_certificate(mbedtls_ssl_context *ssl,
         switch (ret) {
             case 0: /*ok*/
                 break;
-            case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND:
+            case MBEDTLS_ERR_OID_NOT_FOUND:
                 /* Ignore certificate with an unknown algorithm: maybe a
                    prior certificate was already trusted. */
                 break;