diff --git a/src/bacnet/basic/object/objects.h b/src/bacnet/basic/object/objects.h
index 09d6c212..60734d17 100644
--- a/src/bacnet/basic/object/objects.h
+++ b/src/bacnet/basic/object/objects.h
@@ -14,6 +14,7 @@
 #include "bacnet/bacdef.h"
 /* BACnet Stack API */
 #include "bacnet/bacstr.h"
+#include "bacnet/basic/sys/keylist.h"
 
 typedef struct object_device_t {
     BACNET_OBJECT_ID Object_Identifier;