diff --git a/bin/tests/system/checkconf/altdlz.conf b/bin/tests/system/checkconf/altdlz.conf
index 2f663da0f2..f0492b54e0 100644
--- a/bin/tests/system/checkconf/altdlz.conf
+++ b/bin/tests/system/checkconf/altdlz.conf
@@ -23,3 +23,8 @@ zone "example.com" {
 	type master;
 	dlz external;
 };
+
+zone "." {
+	type redirect;
+	dlz external;
+};