diff --git a/tests/function-args.env b/tests/function-args.env
index ac98972..22a760c 100644
--- a/tests/function-args.env
+++ b/tests/function-args.env
@@ -1,4 +1,5 @@
 name=Willy
+MO_ALLOW_FUNCTION_ARGUMENTS=true
 
 pipeTo() {
     echo -n "$1" | "$2"