diff --git a/packages/ember-routing-htmlbars/lib/keywords/render.js b/packages/ember-routing-htmlbars/lib/keywords/render.js
index 2e7155b0bbb..1b26abfc41d 100644
--- a/packages/ember-routing-htmlbars/lib/keywords/render.js
+++ b/packages/ember-routing-htmlbars/lib/keywords/render.js
@@ -73,13 +73,6 @@ export default {
       throw new EmberError('You must pass a templateName to render');
     }
 
-    // # legacy namespace
-    let originalName = name;
-    name = name.replace(/\//g, '.');
-    Ember.deprecate(`Using a slash for namespacing with the {{render}} render helper has been deprecated.
-                     Please replace "${originalName}" with "${name}" in your call to the {{render}} helper.`, !originalName.match(/\//g));
-    // \ legacy slash as namespace support
-
     var templateName = 'template:' + name;
     Ember.assert(
       'You used `{{render \'' + name + '\'}}`, but \'' + name + '\' can not be ' +
diff --git a/packages/ember-routing-htmlbars/tests/helpers/render_test.js b/packages/ember-routing-htmlbars/tests/helpers/render_test.js
index 88578c1535c..fbb527c5bee 100644
--- a/packages/ember-routing-htmlbars/tests/helpers/render_test.js
+++ b/packages/ember-routing-htmlbars/tests/helpers/render_test.js
@@ -528,36 +528,6 @@ QUnit.test('{{render}} works with dot notation', function() {
   equal(singletonController.uniqueId, view.$().html(), 'rendered with correct singleton controller');
 });
 
-QUnit.test('{{render}} works with slash notation', function() {
-  var template = '{{render "blog/post"}}';
-
-  var ContextController = EmberController.extend({ container: container });
-
-  var controller;
-  var id = 0;
-  var BlogPostController = EmberController.extend({
-    init() {
-      this._super.apply(this, arguments);
-      controller = this;
-      this.uniqueId = id++;
-    }
-  });
-  container._registry.register('controller:blog.post', BlogPostController);
-
-  view = EmberView.create({
-    container: container,
-    controller: ContextController.create(),
-    template: compile(template)
-  });
-
-  Ember.TEMPLATES['blog.post'] = compile('{{uniqueId}}');
-
-  expectDeprecation(() => { runAppend(view); }, /Using a slash for namespacing/);
-
-  var singletonController = container.lookup('controller:blog.post');
-  equal(singletonController.uniqueId, view.$().html(), 'rendered with correct singleton controller');
-});
-
 QUnit.test('throws an assertion if {{render}} is called with an unquoted template name', function() {
   var template = '<h1>HI</h1>{{render home}}';
   var controller = EmberController.extend({ container: container });