diff --git a/reg-tests/converter/iif.vtc b/reg-tests/converter/iif.vtc
index 360b63f964..22414e08aa 100644
--- a/reg-tests/converter/iif.vtc
+++ b/reg-tests/converter/iif.vtc
@@ -1,4 +1,5 @@
 varnishtest "iif converter Test"
+#REQUIRE_VERSION=2.3
 
 feature ignore_unknown_macro