diff --git a/src/Illuminate/Foundation/Mix.php b/src/Illuminate/Foundation/Mix.php
index 5da16111c56e..ec151782500d 100644
--- a/src/Illuminate/Foundation/Mix.php
+++ b/src/Illuminate/Foundation/Mix.php
@@ -63,6 +63,6 @@ public function __invoke($path, $manifestDirectory = '')
             }
         }
 
-        return new HtmlString($manifestDirectory.$manifest[$path]);
+        return new HtmlString(app('config')->get('app.mix_url').$manifestDirectory.$manifest[$path]);
     }
 }
diff --git a/tests/Foundation/FoundationHelpersTest.php b/tests/Foundation/FoundationHelpersTest.php
index 5e240abcb543..26194f4f4fd6 100644
--- a/tests/Foundation/FoundationHelpersTest.php
+++ b/tests/Foundation/FoundationHelpersTest.php
@@ -9,6 +9,7 @@
 use Illuminate\Foundation\Mix;
 use PHPUnit\Framework\TestCase;
 use Illuminate\Foundation\Application;
+use Illuminate\Contracts\Config\Repository;
 
 class FoundationHelpersTest extends TestCase
 {
@@ -67,6 +68,10 @@ public function testUnversionedElixir()
 
     public function testMixDoesNotIncludeHost()
     {
+        $app = new Application;
+        $app['config'] = m::mock(Repository::class);
+        $app['config']->shouldReceive('get')->with('app.mix_url');
+
         $manifest = $this->makeManifest();
 
         $result = mix('/unversioned.css');
@@ -78,6 +83,10 @@ public function testMixDoesNotIncludeHost()
 
     public function testMixCachesManifestForSubsequentCalls()
     {
+        $app = new Application;
+        $app['config'] = m::mock(Repository::class);
+        $app['config']->shouldReceive('get')->with('app.mix_url');
+
         $manifest = $this->makeManifest();
         mix('unversioned.css');
         unlink($manifest);
@@ -89,6 +98,10 @@ public function testMixCachesManifestForSubsequentCalls()
 
     public function testMixAssetMissingStartingSlashHaveItAdded()
     {
+        $app = new Application;
+        $app['config'] = m::mock(Repository::class);
+        $app['config']->shouldReceive('get')->with('app.mix_url');
+
         $manifest = $this->makeManifest();
 
         $result = mix('unversioned.css');
@@ -108,6 +121,10 @@ public function testMixMissingManifestThrowsException()
 
     public function testMixWithManifestDirectory()
     {
+        $app = new Application;
+        $app['config'] = m::mock(Repository::class);
+        $app['config']->shouldReceive('get')->with('app.mix_url');
+
         mkdir($directory = __DIR__.'/mix');
         $manifest = $this->makeManifest('mix');