diff --git a/protobuf/protobuf-tests.ts b/protobuf/protobuf-tests.ts
index 7b910d380..077522900 100644
--- a/protobuf/protobuf-tests.ts
+++ b/protobuf/protobuf-tests.ts
@@ -1,4 +1,5 @@
 /// <reference path="protobuf.d.ts" />
+/// <reference path="../node/node.d.ts" />
 
 import ProtoBuf = require("protobufjs");
 
diff --git a/protobuf/protobuf.d.ts b/protobuf/protobuf.d.ts
index bbd4736c8..5e758e7a4 100644
--- a/protobuf/protobuf.d.ts
+++ b/protobuf/protobuf.d.ts
@@ -4,11 +4,11 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 declare module ProtoBuf {
-	interface IBuilder {
+	export interface IBuilder {
 		build: <T>() => T;
 	}
 
-	interface IProtoBufMessage {
+	export interface IProtoBufMessage {
 	    toArrayBuffer(): ArrayBuffer;
 	    toBuffer(): Buffer;
 	}