diff --git a/src/bacnet/bacapp.c b/src/bacnet/bacapp.c
index d6ad88a0..396335fc 100644
--- a/src/bacnet/bacapp.c
+++ b/src/bacnet/bacapp.c
@@ -1426,7 +1426,7 @@ bool bacapp_parse_application_data(BACNET_APPLICATION_TAG tag_number,
                 }
                 break;
             case BACNET_APPLICATION_TAG_OBJECT_ID:
-                count = sscanf(argv, "%4d:%7d", &object_type, &instance);
+                count = sscanf(argv, "%4d:%7u", &object_type, &instance);
                 if (count == 2) {
                     value->type.Object_Id.type = (uint16_t)object_type;
                     value->type.Object_Id.instance = instance;