diff --git a/src/core/ReactInstanceHandles.js b/src/core/ReactInstanceHandles.js
index f9678056ff..000856604b 100644
--- a/src/core/ReactInstanceHandles.js
+++ b/src/core/ReactInstanceHandles.js
@@ -48,7 +48,7 @@ var GLOBAL_MOUNT_POINT_MAX = 9999999;
  * @internal
  */
 function getReactRootIDString(index) {
-  return '.reactRoot[' + index + ']';
+  return SEPARATOR + 'r[' + index.toString(36) + ']';
 }
 
 /**
@@ -316,7 +316,7 @@ var ReactInstanceHandles = {
    * @internal
    */
   getReactRootIDFromNodeID: function(id) {
-    var regexResult = /\.reactRoot\[[^\]]+\]/.exec(id);
+    var regexResult = /\.r\[[^\]]+\]/.exec(id);
     return regexResult && regexResult[0];
   },
 
diff --git a/src/core/ReactMount.js b/src/core/ReactMount.js
index 62d9bc6b13..14f93055b9 100644
--- a/src/core/ReactMount.js
+++ b/src/core/ReactMount.js
@@ -56,7 +56,7 @@ function getReactRootID(container) {
  *   ReactMount.renderComponent(component, $('container'));
  *
  *   <div id="container">                   <-- Supplied `container`.
- *     <div data-reactid=".reactRoot[3]">   <-- Rendered reactRoot of React
+ *     <div data-reactid=".r[3]">           <-- Rendered reactRoot of React
  *       // ...                                 component.
  *     </div>
  *   </div>
diff --git a/src/core/__tests__/ReactIdentity-test.js b/src/core/__tests__/ReactIdentity-test.js
index 9edf0f73ef..36998e9f62 100644
--- a/src/core/__tests__/ReactIdentity-test.js
+++ b/src/core/__tests__/ReactIdentity-test.js
@@ -34,7 +34,7 @@ describe('ReactIdentity', function() {
     ReactID = require('ReactID');
   });
 
-  var idExp = /^\.reactRoot\[\d+\](.*)$/;
+  var idExp = /^\.r\[.+?\](.*)$/;
   function checkId(child, expectedId) {
     var actual = idExp.exec(ReactID.getID(child));
     var expected = idExp.exec(expectedId);
@@ -55,8 +55,8 @@ describe('ReactIdentity', function() {
     React.renderComponent(instance, document.createElement('div'));
     var node = instance.getDOMNode();
     reactComponentExpect(instance).toBeDOMComponentWithChildCount(2);
-    checkId(node.childNodes[0], '.reactRoot[0].[0]{first}');
-    checkId(node.childNodes[1], '.reactRoot[0].[0]{second}');
+    checkId(node.childNodes[0], '.r[0].[0]{first}');
+    checkId(node.childNodes[1], '.r[0].[0]{second}');
   });
 
   it('should allow key property to express identity', function() {
@@ -71,10 +71,10 @@ describe('ReactIdentity', function() {
     React.renderComponent(instance, document.createElement('div'));
     var node = instance.getDOMNode();
     reactComponentExpect(instance).toBeDOMComponentWithChildCount(4);
-    checkId(node.childNodes[0], '.reactRoot[0].[0:apple]');
-    checkId(node.childNodes[1], '.reactRoot[0].[0:banana]');
-    checkId(node.childNodes[2], '.reactRoot[0].[0:0]');
-    checkId(node.childNodes[3], '.reactRoot[0].[0:123]');
+    checkId(node.childNodes[0], '.r[0].[0:apple]');
+    checkId(node.childNodes[1], '.r[0].[0:banana]');
+    checkId(node.childNodes[2], '.r[0].[0:0]');
+    checkId(node.childNodes[3], '.r[0].[0:123]');
   });
 
   it('should use instance identity', function() {
@@ -95,15 +95,15 @@ describe('ReactIdentity', function() {
     React.renderComponent(instance, document.createElement('div'));
     var node = instance.getDOMNode();
     reactComponentExpect(instance).toBeDOMComponentWithChildCount(3);
-    checkId(node.childNodes[0], '.reactRoot[0].[0:wrap1]');
+    checkId(node.childNodes[0], '.r[0].[0:wrap1]');
     checkId(
       node.childNodes[0].firstChild,
-      '.reactRoot[0].[0:wrap1].[0:squirrel]'
+      '.r[0].[0:wrap1].[0:squirrel]'
     );
-    checkId(node.childNodes[1], '.reactRoot[0].[0:wrap2]');
-    checkId(node.childNodes[1].firstChild, '.reactRoot[0].[0:wrap2].[0:bunny]');
-    checkId(node.childNodes[2], '.reactRoot[0].[0:2]');
-    checkId(node.childNodes[2].firstChild, '.reactRoot[0].[0:2].[0:chipmunk]');
+    checkId(node.childNodes[1], '.r[0].[0:wrap2]');
+    checkId(node.childNodes[1].firstChild, '.r[0].[0:wrap2].[0:bunny]');
+    checkId(node.childNodes[2], '.r[0].[0:2]');
+    checkId(node.childNodes[2].firstChild, '.r[0].[0:2].[0:chipmunk]');
   });
 
   it('should let restructured components retain their uniqueness', function() {
diff --git a/src/core/__tests__/ReactInstanceHandles-test.js b/src/core/__tests__/ReactInstanceHandles-test.js
index 331b47a183..4cde75ab5d 100644
--- a/src/core/__tests__/ReactInstanceHandles-test.js
+++ b/src/core/__tests__/ReactInstanceHandles-test.js
@@ -149,8 +149,8 @@ describe('ReactInstanceHandles', function() {
 
   describe('getReactRootIDFromNodeID', function() {
     it('should support strings', function() {
-      var test = '.reactRoot[s_0_1][0]..[1]';
-      var expected = '.reactRoot[s_0_1]';
+      var test = '.r[s_0_1][0]..[1]';
+      var expected = '.r[s_0_1]';
       var actual = ReactInstanceHandles.getReactRootIDFromNodeID(test);
       expect(actual).toEqual(expected);
     });
diff --git a/src/eventPlugins/__tests__/ResponderEventPlugin-test.js b/src/eventPlugins/__tests__/ResponderEventPlugin-test.js
index 6917e6e8b7..5db1e6138b 100644
--- a/src/eventPlugins/__tests__/ResponderEventPlugin-test.js
+++ b/src/eventPlugins/__tests__/ResponderEventPlugin-test.js
@@ -25,9 +25,9 @@ var ReactInstanceHandles;
 var ResponderEventPlugin;
 var SyntheticEvent;
 
-var GRANDPARENT_ID = '.reactRoot[0]';
-var PARENT_ID = '.reactRoot[0].0';
-var CHILD_ID = '.reactRoot[0].0.0';
+var GRANDPARENT_ID = '.r[0]';
+var PARENT_ID = '.r[0].0';
+var CHILD_ID = '.r[0].0.0';
 
 var topLevelTypes;
 var responderEventTypes;