diff --git a/lib/src/iterables/concat.dart b/lib/src/iterables/concat.dart
index b4ab751a..245bf834 100644
--- a/lib/src/iterables/concat.dart
+++ b/lib/src/iterables/concat.dart
@@ -19,4 +19,5 @@ part of quiver.iterables;
  *
  * The returned iterable is a lazily-evaluated view on the input iterables.
  */
-Iterable concat(Iterable<Iterable> iterables) => iterables.expand((x) => x);
+Iterable/*<T>*/ concat/*<T>*/(Iterable<Iterable/*<T>*/> iterables) =>
+    iterables.expand((x) => x);