diff --git a/src/include/netif/bridgeif_opts.h b/src/include/netif/bridgeif_opts.h
index 4774d3a3..9abe0242 100644
--- a/src/include/netif/bridgeif_opts.h
+++ b/src/include/netif/bridgeif_opts.h
@@ -51,10 +51,11 @@
  * the selected forwarding port's 'linkoutput' function.
  * This means that the bridgeif input/output path is protected from concurrent access
  * but as well, the port netif's drivers must correctly handle concurrent access!
- * == 0 (default): get into tcpip_thread for every input packet (no multithreading)
+ * == 0: get into tcpip_thread for every input packet (no multithreading)
+ * ATTENTION: as ==0 relies on tcpip.h, the default depends on NO_SYS setting
  */
 #ifndef BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT
-#define BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT  0
+#define BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT  NO_SYS
 #endif
 
 /** BRIDGEIF_EXTERNAL_FDB==1: use an external implementation for the forwarding