diff --git a/bacnet-stack/demo/handler/h_rp_a.c b/bacnet-stack/demo/handler/h_rp_a.c
index 63105050..e034ee28 100644
--- a/bacnet-stack/demo/handler/h_rp_a.c
+++ b/bacnet-stack/demo/handler/h_rp_a.c
@@ -24,6 +24,7 @@
 *********************************************************************/
 #include <stddef.h>
 #include <stdint.h>
+#include <stdlib.h>
 #include "config.h"
 #include "config.h"
 #include "txbuf.h"
@@ -43,8 +44,8 @@
 
 /** @file h_rp_a.c  Handles Read Property Acknowledgments. */
 
-/** For debugging... 
- * @param [in] data portion of the ACK 
+/** For debugging...
+ * @param [in] data portion of the ACK
  */
 static void PrintReadPropertyData(
     BACNET_READ_PROPERTY_DATA * data)
@@ -112,12 +113,12 @@ static void PrintReadPropertyData(
  * @ingroup DSRP
  * Doesn't actually do anything, except, for debugging, to
  * print out the ACK message.
- * 
+ *
  * @param service_request [in] The contents of the service request.
  * @param service_len [in] The length of the service_request.
  * @param src [in] BACNET_ADDRESS of the source of the message
- * @param service_data [in] The BACNET_CONFIRMED_SERVICE_DATA information 
- *                          decoded from the APDU header of this message. 
+ * @param service_data [in] The BACNET_CONFIRMED_SERVICE_DATA information
+ *                          decoded from the APDU header of this message.
  */
 void handler_read_property_ack(
     uint8_t * service_request,