diff --git a/t_stub.c b/t_stub.c
index 17baee82..2748ca20 100644
--- a/t_stub.c
+++ b/t_stub.c
@@ -104,3 +104,8 @@ filter_rule_list daemon_filter_list;
 {
 	return cst || !flg ? 16 : 1;
 }
+
+ int canonical_checksum(int cst)
+{
+	return cst ? 0 : 0;
+}