diff --git a/bacnet-stack/demo/handler/h_whois.c b/bacnet-stack/demo/handler/h_whois.c
index 1071ed98..98614c89 100644
--- a/bacnet-stack/demo/handler/h_whois.c
+++ b/bacnet-stack/demo/handler/h_whois.c
@@ -32,6 +32,7 @@
 #include "bacdef.h"
 #include "bacdcode.h"
 #include "whois.h"
+#include "iam.h"
 #include "device.h"
 #include "client.h"
 #include "txbuf.h"