diff --git a/protobuf/protobuf-tests.ts b/protobuf/protobuf-tests.ts
new file mode 100644
index 000000000..7b910d380
--- /dev/null
+++ b/protobuf/protobuf-tests.ts
@@ -0,0 +1,11 @@
+/// <reference path="protobuf.d.ts" />
+
+import ProtoBuf = require("protobufjs");
+
+ProtoBuf.loadProtoFile("test.proto", builder => {
+	builder.build();
+
+	var message: ProtoBuf.IProtoBufMessage;
+	message.toArrayBuffer();
+	message.toBuffer();
+});
diff --git a/protobuf/protobuf.d.ts b/protobuf/protobuf.d.ts
new file mode 100644
index 000000000..bbd4736c8
--- /dev/null
+++ b/protobuf/protobuf.d.ts
@@ -0,0 +1,21 @@
+// Type definitions for ProtoBuf.js
+// Project: https://github.com/dcodeIO/ProtoBuf.js
+// Definitions by: Panu Horsmalahti
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module ProtoBuf {
+	interface IBuilder {
+		build: <T>() => T;
+	}
+
+	interface IProtoBufMessage {
+	    toArrayBuffer(): ArrayBuffer;
+	    toBuffer(): Buffer;
+	}
+
+	export function loadProtoFile(filePath: string, callback: (builder: IBuilder) => void): any;
+}
+
+declare module "protobufjs" {
+    export = ProtoBuf;
+}