diff --git a/lib/src/default_revset_engine.rs b/lib/src/default_revset_engine.rs
index 2e9282bd7..bbacc0840 100644
--- a/lib/src/default_revset_engine.rs
+++ b/lib/src/default_revset_engine.rs
@@ -688,11 +688,9 @@ impl<'index, 'heads> EvaluationContext<'index, 'heads> {
                     .revset_for_commit_ids(&self.composite_index.heads(&mut candidate_ids.iter())))
             }
             RevsetExpression::Roots(candidates) => {
-                let connected_set = self.evaluate(&candidates.connected())?;
-                let filled: HashSet<_> =
-                    connected_set.iter().map(|entry| entry.position()).collect();
-                let mut index_entries = vec![];
                 let candidate_set = self.evaluate(candidates)?;
+                let (_, filled) = self.collect_dag_range(&*candidate_set, &*candidate_set);
+                let mut index_entries = vec![];
                 for candidate in candidate_set.iter() {
                     if !candidate
                         .parent_positions()