diff --git a/bacnet-stack/demo/handler/h_npdu.c b/bacnet-stack/demo/handler/h_npdu.c
index 4d6fc96b..448f8f50 100644
--- a/bacnet-stack/demo/handler/h_npdu.c
+++ b/bacnet-stack/demo/handler/h_npdu.c
@@ -55,7 +55,7 @@ void npdu_handler(
         if (npdu_data.network_layer_message) {
             /*FIXME: network layer message received!  Handle it! */
 #if PRINT_ENABLED
-            printf("NPDU: Network Layer Message discarded!\n");
+            fprintf(stderr,"NPDU: Network Layer Message discarded!\n");
 #endif
         } else if ((apdu_offset > 0) && (apdu_offset <= pdu_len)) {
             if ((dest.net == 0) || (dest.net == BACNET_BROADCAST_NETWORK)) {