diff --git a/packages/ember-metal/lib/environment.js b/packages/ember-metal/lib/environment.js
index d3e79c07de6..0bebf1db80a 100644
--- a/packages/ember-metal/lib/environment.js
+++ b/packages/ember-metal/lib/environment.js
@@ -26,6 +26,7 @@ if (hasDOM) {
     hasDOM: true,
     isChrome: !!window.chrome && !window.opera,
     isFirefox: typeof InstallTrigger !== 'undefined',
+    isPhantom: !!window.callPhantom,
     location: window.location,
     history: window.history,
     userAgent: window.navigator.userAgent,
@@ -36,6 +37,7 @@ if (hasDOM) {
     hasDOM: false,
     isChrome: false,
     isFirefox: false,
+    isPhantom: false,
     location: null,
     history: null,
     userAgent: 'Lynx (textmode)',
diff --git a/packages/ember-metal/lib/utils.js b/packages/ember-metal/lib/utils.js
index 886115e0693..9a939f89a45 100644
--- a/packages/ember-metal/lib/utils.js
+++ b/packages/ember-metal/lib/utils.js
@@ -254,10 +254,10 @@ export function guidFor(obj) {
 
 const HAS_SUPER_PATTERN = /\.(_super|call\(this|apply\(this)/;
 
-const checkHasSuper = (function () {
+export const checkHasSuper = (function () {
   let sourceAvailable = (function() {
     return this;
-  }).toString().indexOf('return this;') > -1;
+  }).toString().indexOf('return this') > -1;
 
   if (sourceAvailable) {
     return function checkHasSuper(func) {
diff --git a/packages/ember-metal/tests/utils_test.js b/packages/ember-metal/tests/utils_test.js
index 444c9d092af..ca0d1624d23 100644
--- a/packages/ember-metal/tests/utils_test.js
+++ b/packages/ember-metal/tests/utils_test.js
@@ -1,4 +1,5 @@
-import { inspect } from 'ember-metal/utils';
+import { inspect, checkHasSuper } from 'ember-metal/utils';
+import environment from 'ember-metal/environment';
 
 QUnit.module('Ember Metal Utils');
 
@@ -14,3 +15,12 @@ QUnit.test('inspect outputs the toString() representation of Symbols', function(
     expect(0);
   }
 });
+
+// Only run this test on browsers that we are certain should have function
+// source available.  This allows the test suite to continue to pass on other
+// platforms that correctly (for them) fall back to the "always wrap" code.
+if (environment.isPhantom || environment.isChrome || environment.isFirefox) {
+  QUnit.test('does not super wrap needlessly [GH #12462]', function(assert) {
+    assert.notOk(checkHasSuper(function() {}), 'empty function does not have super');
+  });
+}