diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 0c992bf..519b5b4 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -7016,7 +7016,7 @@
 #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
         switch (ret) {
             case 0: /*ok*/
-            case MBEDTLS_ERR_OID_NOT_FOUND:
+            case MBEDTLS_ERR_X509_UNKNOWN_OID:
                 /* Ignore certificate with an unknown algorithm: maybe a
                    prior certificate was already trusted. */
                 break;