diff --git a/vortex-array/src/array/arbitrary.rs b/vortex-array/src/array/arbitrary.rs
index 23b38d33c..e633971de 100644
--- a/vortex-array/src/array/arbitrary.rs
+++ b/vortex-array/src/array/arbitrary.rs
@@ -136,7 +136,7 @@ where
                 .map(|_| random_scalar(u, ldt))
                 .collect::<Result<Vec<_>>>()?;
             builder
-                .append_value(Scalar::list(ldt.clone(), elem).as_list())
+                .append_value(Scalar::list(ldt.clone(), elem, n.clone()).as_list())
                 .vortex_expect("can append value");
         } else {
             builder.append_null();