diff --git a/CHANGELOG.md b/CHANGELOG.md
index cde274e..023abd4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.5.1
+
+* Fix an incorrectly-declared generic type.
+
 ## 1.5.0
 
 * Add `DelegatingIterable.typed()`, `DelegatingList.typed()`,
diff --git a/lib/src/wrappers.dart b/lib/src/wrappers.dart
index 97de461..752987b 100644
--- a/lib/src/wrappers.dart
+++ b/lib/src/wrappers.dart
@@ -359,7 +359,7 @@
   /// reflected in [this]. If [base] is already a `Map<K, V>`, it's returned
   /// unmodified.
   static Map/*<K, V>*/ typed/*<K, V>*/(Map base) =>
-      base is Map<K, V> ? base : new TypeSafeMap<K, V>(base);
+      base is Map/*<K, V>*/ ? base : new TypeSafeMap/*<K, V>*/(base);
 
   V operator [](Object key) => _base[key];
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 5023dbe..d9680c7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: collection
-version: 1.5.0
+version: 1.5.1
 author: Dart Team <misc@dartlang.org>
 description: Collections and utilities functions and classes related to collections.
 homepage: https://www.github.com/dart-lang/collection