diff --git a/mers/src/script/val_type.rs b/mers/src/script/val_type.rs
index 0b15d3b..20d994e 100755
--- a/mers/src/script/val_type.rs
+++ b/mers/src/script/val_type.rs
@@ -204,7 +204,7 @@ impl VSingleType {
                 // function that takes no inputs
                 if let Some(out) = f.iter().find_map(|(args, out)| {
                     if args.is_empty() {
-                        Some(out.clone())
+                        Some(out.clone().inner_types())
                     } else {
                         None
                     }