diff --git a/ext/descriptor/index.js b/ext/descriptor/index.js
index 0b32d022c..6aafd2ab8 100644
--- a/ext/descriptor/index.js
+++ b/ext/descriptor/index.js
@@ -660,12 +660,12 @@ Service.prototype.toDescriptor = function toDescriptor() {
 
     // Methods
     var methods = [];
-    for (var i = 0; i < this.methodsArray; ++i)
+    for (var i = 0; i < this.methodsArray.length; ++i)
         methods.push(this._methodsArray[i].toDescriptor());
 
     return exports.ServiceDescriptorProto.create({
         name: this.name,
-        methods: methods,
+        method: methods,
         options: toDescriptorOptions(this.options, exports.ServiceOptions)
     });
 };