diff --git a/lib/client.c b/lib/client.c
index 28fcadbc..79b0bbe2 100644
--- a/lib/client.c
+++ b/lib/client.c
@@ -125,9 +125,10 @@ int lws_client_socket_service(struct libwebsocket_context *context,
 		if (wsi->use_ssl && !wsi->ssl) {
 
 			wsi->ssl = SSL_new(context->ssl_client_ctx);
+#ifndef USE_CYASSL
 			SSL_set_mode(wsi->ssl,
 					SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
-
+#endif
 
 		/* use server name indication (SNI), if supported,
 		 * when establishing connection */
diff --git a/lib/server.c b/lib/server.c
index 2e76cd6d..edb94497 100644
--- a/lib/server.c
+++ b/lib/server.c
@@ -316,8 +316,9 @@ int lws_server_socket_service(struct libwebsocket_context *context,
 			openssl_websocket_private_data_index, context);
 
 		SSL_set_fd(new_wsi->ssl, accept_fd);
+#ifndef USE_CYASSL
 		SSL_set_mode(new_wsi->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
-
+#endif
 		#ifdef USE_CYASSL
 		CyaSSL_set_using_nonblock(new_wsi->ssl, 1);
 		#else