diff --git a/bacnet-stack/demo/handler/h_rpm_a.c b/bacnet-stack/demo/handler/h_rpm_a.c
index 458cca6c..b30932df 100644
--- a/bacnet-stack/demo/handler/h_rpm_a.c
+++ b/bacnet-stack/demo/handler/h_rpm_a.c
@@ -23,7 +23,8 @@
 *
 *********************************************************************/
 #include <stddef.h>
-#include <stdint.h>
+#include <stdint.h>
+#include <stdlib.h>
 #include "config.h"
 #include "config.h"
 #include "txbuf.h"