diff --git a/src/common/tortls.c b/src/common/tortls.c
index f0c4c7dc57..1010425e13 100644
--- a/src/common/tortls.c
+++ b/src/common/tortls.c
@@ -1386,6 +1386,8 @@ tor_tls_context_new(crypto_pk_t *identity, unsigned int key_lifetime,
       SSL_CTX_set_tmp_ecdh(result->ctx, ec_key);
     EC_KEY_free(ec_key);
   }
+#else
+  (void)flags;
 #endif
   SSL_CTX_set_verify(result->ctx, SSL_VERIFY_PEER,
                      always_accept_verify_cb);