diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce7c6017f1cde..7f257de7090dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.10.4
+
+* Added separate getter for `BuilderInfo.qualifiedMessageName`.
+
 ## 0.10.3
 
 * Added type argument to `ProtobufEnum.initByValue` which allows the return
diff --git a/lib/src/protobuf/builder_info.dart b/lib/src/protobuf/builder_info.dart
index 0670c56241b59..95fa4d41d4f02 100644
--- a/lib/src/protobuf/builder_info.dart
+++ b/lib/src/protobuf/builder_info.dart
@@ -7,7 +7,7 @@ part of protobuf;
 /// Per-message type setup.
 class BuilderInfo {
   /// The fully qualified name of this message.
-  final String messageName;
+  final String qualifiedMessageName;
   final List<FieldInfo> byIndex = <FieldInfo>[];
   final Map<int, FieldInfo> fieldInfo = new Map<int, FieldInfo>();
   final Map<String, FieldInfo> byTagAsString = <String, FieldInfo>{};
@@ -17,7 +17,7 @@ class BuilderInfo {
   List<FieldInfo> _sortedByTag;
 
   BuilderInfo(String messageName, {PackageName package = const PackageName('')})
-      : messageName = "${package.prefix}$messageName";
+      : qualifiedMessageName = "${package.prefix}$messageName";
 
   void add<T>(
       int tagNumber,
@@ -151,9 +151,17 @@ class BuilderInfo {
     return i != null ? i.valueOf : null;
   }
 
-  /// Returns the FieldInfo for each field in tag number order.
+  /// The FieldInfo for each field in tag number order.
   List<FieldInfo> get sortedByTag => _sortedByTag ??= _computeSortedByTag();
 
+  /// The message name. Also see [qualifiedMessageName].
+  String get messageName {
+    final lastDot = qualifiedMessageName.lastIndexOf('.');
+    return lastDot == -1
+        ? qualifiedMessageName
+        : qualifiedMessageName.substring(lastDot + 1);
+  }
+
   List<FieldInfo> _computeSortedByTag() {
     // TODO(skybrian): perhaps the code generator should insert the FieldInfos
     // in tag number order, to avoid sorting them?
@@ -165,8 +173,9 @@ class BuilderInfo {
       int tagNumber, ExtensionRegistry extensionRegistry) {
     CreateBuilderFunc subBuilderFunc = subBuilder(tagNumber);
     if (subBuilderFunc == null && extensionRegistry != null) {
-      subBuilderFunc =
-          extensionRegistry.getExtension(messageName, tagNumber).subBuilder;
+      subBuilderFunc = extensionRegistry
+          .getExtension(qualifiedMessageName, tagNumber)
+          .subBuilder;
     }
     return subBuilderFunc();
   }
@@ -174,7 +183,7 @@ class BuilderInfo {
   _decodeEnum(int tagNumber, ExtensionRegistry registry, int rawValue) {
     ValueOfFunc f = valueOfFunc(tagNumber);
     if (f == null && registry != null) {
-      f = registry.getExtension(messageName, tagNumber).valueOf;
+      f = registry.getExtension(qualifiedMessageName, tagNumber).valueOf;
     }
     return f(rawValue);
   }
diff --git a/lib/src/protobuf/coded_buffer_reader.dart b/lib/src/protobuf/coded_buffer_reader.dart
index c448e85c00c67..bab15f6a6b539 100644
--- a/lib/src/protobuf/coded_buffer_reader.dart
+++ b/lib/src/protobuf/coded_buffer_reader.dart
@@ -17,8 +17,8 @@ class CodedBufferReader {
   final int _sizeLimit;
 
   CodedBufferReader(List<int> buffer,
-      {int recursionLimit: DEFAULT_RECURSION_LIMIT,
-      int sizeLimit: DEFAULT_SIZE_LIMIT})
+      {int recursionLimit = DEFAULT_RECURSION_LIMIT,
+      int sizeLimit = DEFAULT_SIZE_LIMIT})
       : _buffer = buffer is Uint8List ? buffer : new Uint8List(buffer.length)
           ..setRange(0, buffer.length, buffer),
         _recursionLimit = recursionLimit,
diff --git a/lib/src/protobuf/field_set.dart b/lib/src/protobuf/field_set.dart
index 9448fecae105d..883511aef3cd4 100644
--- a/lib/src/protobuf/field_set.dart
+++ b/lib/src/protobuf/field_set.dart
@@ -63,7 +63,7 @@ class _FieldSet {
 
   // Metadata about multiple fields
 
-  String get _messageName => _meta.messageName;
+  String get _messageName => _meta.qualifiedMessageName;
   bool get _hasRequiredFields => _meta.hasRequiredFields;
 
   /// The FieldInfo for each non-extension field.
diff --git a/lib/src/protobuf/mixins/map_mixin.dart b/lib/src/protobuf/mixins/map_mixin.dart
index 7079aa4716766..87c38bb74ca67 100644
--- a/lib/src/protobuf/mixins/map_mixin.dart
+++ b/lib/src/protobuf/mixins/map_mixin.dart
@@ -32,7 +32,7 @@ abstract class PbMapMixin {
     var tag = getTagNumber(key as String);
     if (tag == null) {
       throw new ArgumentError(
-          "field '${key}' not found in ${info_.messageName}");
+          "field '${key}' not found in ${info_.qualifiedMessageName}");
     }
     setField(tag, val);
   }
@@ -45,6 +45,6 @@ abstract class PbMapMixin {
 
   remove(key) {
     throw new UnsupportedError(
-        "remove() not supported by ${info_.messageName}");
+        "remove() not supported by ${info_.qualifiedMessageName}");
   }
 }
diff --git a/lib/src/protobuf/pb_list.dart b/lib/src/protobuf/pb_list.dart
index 8517910f38d8f..7c2c1c365ec86 100644
--- a/lib/src/protobuf/pb_list.dart
+++ b/lib/src/protobuf/pb_list.dart
@@ -154,9 +154,9 @@ abstract class PbListBase<E> extends ListBase<E> {
   final List<E> _wrappedList;
   final CheckFunc<E> check;
 
-  PbListBase._(this._wrappedList, {this.check: _checkNotNull}) {}
+  PbListBase._(this._wrappedList, {this.check = _checkNotNull}) {}
 
-  PbListBase._noList({this.check: _checkNotNull}) : _wrappedList = <E>[] {
+  PbListBase._noList({this.check = _checkNotNull}) : _wrappedList = <E>[] {
     assert(check != null);
   }
 
@@ -222,7 +222,7 @@ abstract class PbListBase<E> extends ListBase<E> {
   bool any(bool test(E element)) => _wrappedList.any(test);
 
   /// Creates a [List] containing the elements of this [Iterable].
-  List<E> toList({bool growable: true}) =>
+  List<E> toList({bool growable = true}) =>
       _wrappedList.toList(growable: growable);
 
   /// Creates a [Set] containing the same elements as this iterable.
diff --git a/lib/src/protobuf/readonly_message.dart b/lib/src/protobuf/readonly_message.dart
index a711961a35009..f6edf1ecb805e 100644
--- a/lib/src/protobuf/readonly_message.dart
+++ b/lib/src/protobuf/readonly_message.dart
@@ -53,7 +53,7 @@ abstract class ReadonlyMessageMixin {
       _readonly("setField");
 
   void _readonly(String methodName) {
-    String messageType = info_.messageName;
+    String messageType = info_.qualifiedMessageName;
     frozenMessageModificationHandler(messageType, methodName);
   }
 }
diff --git a/lib/src/protobuf/unpack.dart b/lib/src/protobuf/unpack.dart
index 142ebcd10a059..7fb20cef6e59b 100644
--- a/lib/src/protobuf/unpack.dart
+++ b/lib/src/protobuf/unpack.dart
@@ -21,7 +21,7 @@ void unpackIntoHelper<T extends GeneratedMessage>(
   //   in the type URL, for example "foo.bar.com/x/y.z" will yield type
   //   name "y.z".
   if (!canUnpackIntoHelper(instance, typeUrl)) {
-    String typeName = instance.info_.messageName;
+    String typeName = instance.info_.qualifiedMessageName;
     throw new InvalidProtocolBufferException.wrongAnyMessage(
         _typeNameFromUrl(typeUrl), typeName);
   }
@@ -33,7 +33,7 @@ void unpackIntoHelper<T extends GeneratedMessage>(
 ///
 /// This is a helper method for `Any.canUnpackInto`.
 bool canUnpackIntoHelper(GeneratedMessage instance, String typeUrl) {
-  return instance.info_.messageName == _typeNameFromUrl(typeUrl);
+  return instance.info_.qualifiedMessageName == _typeNameFromUrl(typeUrl);
 }
 
 String _typeNameFromUrl(String typeUrl) {
diff --git a/pubspec.yaml b/pubspec.yaml
index 018e537326ae2..c8eba3eb57754 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: protobuf
-version: 0.10.3
+version: 0.10.4
 author: Dart Team <misc@dartlang.org>
 description: >
   Runtime library for protocol buffers support.
diff --git a/test/builder_info_test.dart b/test/builder_info_test.dart
new file mode 100644
index 0000000000000..6df57ab82d6c3
--- /dev/null
+++ b/test/builder_info_test.dart
@@ -0,0 +1,22 @@
+// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:protobuf/protobuf.dart';
+import 'package:test/test.dart';
+
+main() {
+  group('className', () {
+    final qualifiedmessageName = 'proto.test.TestMessage';
+    final expectedMessageName = 'TestMessage';
+    test('truncates qualifiedMessageName containing dots', () {
+      final info = new BuilderInfo(qualifiedmessageName);
+      expect(info.messageName, expectedMessageName);
+    });
+
+    test('uses qualifiedMessageName if it contains no dots', () {
+      final info = new BuilderInfo(expectedMessageName);
+      expect(info.messageName, expectedMessageName);
+    });
+  });
+}