diff --git a/bacnet-stack/demo/initrouter/main.c b/bacnet-stack/demo/initrouter/main.c
index 1543661b..f3161394 100644
--- a/bacnet-stack/demo/initrouter/main.c
+++ b/bacnet-stack/demo/initrouter/main.c
@@ -41,7 +41,9 @@
 #include "datalink.h"
 #include "version.h"
 /* some demo stuff needed */
+#ifndef DEBUG_ENABLED
 #define DEBUG_ENABLED 0
+#endif
 #include "debug.h"
 #include "filename.h"
 #include "handlers.h"
diff --git a/bacnet-stack/demo/readbdt/main.c b/bacnet-stack/demo/readbdt/main.c
index f18aa8e0..2848647b 100644
--- a/bacnet-stack/demo/readbdt/main.c
+++ b/bacnet-stack/demo/readbdt/main.c
@@ -42,7 +42,9 @@
 #include "datalink.h"
 #include "bvlc.h"
 /* some demo stuff needed */
+#ifndef DEBUG_ENABLED
 #define DEBUG_ENABLED 0
+#endif
 #include "debug.h"
 #include "filename.h"
 #include "handlers.h"
diff --git a/bacnet-stack/demo/whoisrouter/main.c b/bacnet-stack/demo/whoisrouter/main.c
index c3b7eb99..b5fce8d6 100644
--- a/bacnet-stack/demo/whoisrouter/main.c
+++ b/bacnet-stack/demo/whoisrouter/main.c
@@ -40,7 +40,9 @@
 #include "device.h"
 #include "datalink.h"
 /* some demo stuff needed */
+#ifndef DEBUG_ENABLED
 #define DEBUG_ENABLED 0
+#endif
 #include "debug.h"
 #include "filename.h"
 #include "handlers.h"