diff --git a/lib/datastore/entity.js b/lib/datastore/entity.js
index c73c042836c..3a013dfdc1f 100644
--- a/lib/datastore/entity.js
+++ b/lib/datastore/entity.js
@@ -76,8 +76,16 @@ var SIGN_TO_ORDER = {
  * });
  */
 function Key(options) {
-  this.namespace_ = options.namespace;
-  this.path_ = options.path;
+  Object.defineProperties(this, {
+    namespace: {
+      enumerable: true,
+      value: options.namespace
+    },
+    path: {
+      enumerable: true,
+      value: options.path
+    }
+  });
 }
 
 module.exports.Key = Key;
@@ -219,7 +227,7 @@ module.exports.keyFromKeyProto = keyFromKeyProto;
  * // }
  */
 function keyToKeyProto(key) {
-  var keyPath = key.path_;
+  var keyPath = key.path;
   if (keyPath.length < 2) {
     throw new Error('A key should contain at least a kind and an identifier.');
   }
@@ -240,9 +248,9 @@ function keyToKeyProto(key) {
   var proto = {
     path_element: path
   };
-  if (key.namespace_) {
+  if (key.namespace) {
     proto.partition_id = {
-      namespace: key.namespace_
+      namespace: key.namespace
     };
   }
   return proto;
diff --git a/regression/datastore.js b/regression/datastore.js
index 2d1c6076b9e..3a1ed3f86ec 100644
--- a/regression/datastore.js
+++ b/regression/datastore.js
@@ -51,7 +51,7 @@ describe('datastore', function() {
       var postKey = ds.key('Post', 'post1');
       ds.save({ key: postKey, data: post }, function(err, key) {
         assert.ifError(err);
-        assert.equal(key.path_[1], 'post1');
+        assert.equal(key.path[1], 'post1');
         ds.get(key, function(err, entity) {
           assert.ifError(err);
           assert.deepEqual(entity.data, post);
@@ -70,7 +70,7 @@ describe('datastore', function() {
         data: post
       }, function(err, key) {
         assert.ifError(err);
-        assert.equal(key.path_[1], 123456789);
+        assert.equal(key.path[1], 123456789);
         ds.get(key, function(err, entity) {
           assert.ifError(err);
           assert.deepEqual(entity.data, post);
@@ -88,7 +88,7 @@ describe('datastore', function() {
         data: post
       }, function(err, key) {
         assert.ifError(err);
-        var assignedId = key.path_[1];
+        var assignedId = key.path[1];
         assert(assignedId);
         ds.get(ds.key('Post', assignedId), function(err, entity) {
           assert.ifError(err);
@@ -118,8 +118,8 @@ describe('datastore', function() {
       ], function(err, keys) {
         assert.ifError(err);
         assert.equal(keys.length,2);
-        var firstKey = ds.key('Post', keys[0].path_[1]);
-        var secondKey = ds.key('Post', keys[1].path_[1]);
+        var firstKey = ds.key('Post', keys[0].path[1]);
+        var secondKey = ds.key('Post', keys[1].path[1]);
         ds.get([firstKey, secondKey], function(err, entities) {
           assert.ifError(err);
           assert.equal(entities.length, 2);
diff --git a/test/datastore/dataset.js b/test/datastore/dataset.js
index ba441d6dada..e442928f8fe 100644
--- a/test/datastore/dataset.js
+++ b/test/datastore/dataset.js
@@ -29,8 +29,8 @@ describe('Dataset', function() {
   it('should return a key scoped by namespace', function() {
     var ds = new datastore.Dataset({ projectId: 'test', namespace: 'my-ns' });
     var key = ds.key('Company', 1);
-    assert.equal(key.namespace_, 'my-ns');
-    assert.deepEqual(key.path_, ['Company', 1]);
+    assert.equal(key.namespace, 'my-ns');
+    assert.deepEqual(key.path, ['Company', 1]);
   });
 
   it('should allow namespace specification when creating a key', function() {
@@ -39,8 +39,8 @@ describe('Dataset', function() {
       namespace: 'custom-ns',
       path: ['Company', 1]
     });
-    assert.equal(key.namespace_, 'custom-ns');
-    assert.deepEqual(key.path_, ['Company', 1]);
+    assert.equal(key.namespace, 'custom-ns');
+    assert.deepEqual(key.path, ['Company', 1]);
   });
 
   it('should get by key', function(done) {
@@ -52,7 +52,7 @@ describe('Dataset', function() {
     };
     ds.get(ds.key('Kind', 123), function(err, entity) {
       var data = entity.data;
-      assert.deepEqual(entity.key.path_, ['Kind', 5732568548769792]);
+      assert.deepEqual(entity.key.path, ['Kind', 5732568548769792]);
       assert.strictEqual(data.author, 'Silvano');
       assert.strictEqual(data.isDraft, false);
       assert.deepEqual(data.publishedAt, new Date(978336000000));
@@ -71,7 +71,7 @@ describe('Dataset', function() {
     ds.get([key], function(err, entities) {
       var entity = entities[0];
       var data = entity.data;
-      assert.deepEqual(entity.key.path_, ['Kind', 5732568548769792]);
+      assert.deepEqual(entity.key.path, ['Kind', 5732568548769792]);
       assert.strictEqual(data.author, 'Silvano');
       assert.strictEqual(data.isDraft, false);
       assert.deepEqual(data.publishedAt, new Date(978336000000));
@@ -306,7 +306,7 @@ describe('Dataset', function() {
 
       ds.runQuery(query, function (err, entities) {
         assert.ifError(err);
-        assert.deepEqual(entities[0].key.path_, ['Kind', 5732568548769792]);
+        assert.deepEqual(entities[0].key.path, ['Kind', 5732568548769792]);
 
         var data = entities[0].data;
         assert.strictEqual(data.author, 'Silvano');