diff --git a/bacnet-stack/demo/whois/main.c b/bacnet-stack/demo/whois/main.c
index c3a3c812..6cea6375 100644
--- a/bacnet-stack/demo/whois/main.c
+++ b/bacnet-stack/demo/whois/main.c
@@ -39,6 +39,7 @@
 #include "apdu.h"
 #include "device.h"
 #include "datalink.h"
+#include "bactext.h"
 /* some demo stuff needed */
 #include "filename.h"
 #include "handlers.h"