diff --git a/bacnet-stack/include/bacdef.h b/bacnet-stack/include/bacdef.h
index 9adb9a4e..1332959c 100644
--- a/bacnet-stack/include/bacdef.h
+++ b/bacnet-stack/include/bacdef.h
@@ -103,7 +103,7 @@
     /* Addendum 135-2012ai */
 #define MAX_ASHRAE_OBJECT_TYPE 57
 #define MAX_BACNET_SERVICES_SUPPORTED 41
-#elif (BACNET_PROTOCOL_REVISION == 18) || (BACNET_PROTOCOL_REVISION == 15)
+#elif (BACNET_PROTOCOL_REVISION == 18) || (BACNET_PROTOCOL_REVISION == 19)
     /* from 135-2016 version of the BACnet Standard */
 #define MAX_ASHRAE_OBJECT_TYPE 60
 #define MAX_BACNET_SERVICES_SUPPORTED 44