diff --git a/packages/combinator/lib/src/combinator/combinator.dart b/packages/combinator/lib/src/combinator/combinator.dart
index 4c2f2ab4..4048d934 100644
--- a/packages/combinator/lib/src/combinator/combinator.dart
+++ b/packages/combinator/lib/src/combinator/combinator.dart
@@ -196,7 +196,9 @@ abstract class Parser<T> {
             v.isEmpty ? [] : (r.value?[0] == null ? [] : [r.value?[0]]);
         var out = List<T>.from(preceding);
         if (r.value?[1] != null) {
-          out.addAll(r.value?[1] as List<T>);
+          (r.value?[1] as List<T>).forEach((element) {
+            out.add(element);
+          });
         }
         return out;
       } else {