diff --git a/src/Shell/Task/AssetsTask.php b/src/Shell/Task/AssetsTask.php
index 36979941928..9ce631b57ec 100644
--- a/src/Shell/Task/AssetsTask.php
+++ b/src/Shell/Task/AssetsTask.php
@@ -49,7 +49,7 @@ public function symlink($name = null)
      */
     public function copy($name = null)
     {
-        $this->_process($this->_list($name), true);
+        $this->_process($this->_list($name), true, $this->param('overwrite'));
     }
 
     /**
@@ -112,9 +112,10 @@ protected function _list($name = null)
      *
      * @param array $plugins List of plugins to process
      * @param bool $copy Force copy mode. Default false.
+     * @param bool $overwrite Overwrite existing files.
      * @return void
      */
-    protected function _process($plugins, $copy = false)
+    protected function _process($plugins, $copy = false, $overwrite = false)
     {
         foreach ($plugins as $plugin => $config) {
             $this->out();
@@ -128,7 +129,7 @@ protected function _process($plugins, $copy = false)
                 continue;
             }
 
-            if (file_exists($config['destDir'] . $config['link'])) {
+            if (file_exists($config['destDir'] . $config['link']) && !$overwrite) {
                 $this->out(
                     $config['destDir'] . $config['link'] . ' already exists',
                     1,
@@ -241,6 +242,9 @@ public function getOptionParser()
         ])->addArgument('name', [
             'help' => 'A specific plugin you want to symlink assets for.',
             'optional' => true,
+        ])->addOption('overwrite', [
+            'help' => 'Overwrite existing files.',
+            'boolean' => true
         ]);
 
         return $parser;
diff --git a/tests/TestCase/Shell/Task/AssetsTaskTest.php b/tests/TestCase/Shell/Task/AssetsTaskTest.php
index 9317da10909..b006ef22546 100644
--- a/tests/TestCase/Shell/Task/AssetsTaskTest.php
+++ b/tests/TestCase/Shell/Task/AssetsTaskTest.php
@@ -204,4 +204,35 @@ public function testCopy()
         $folder = new Folder(WWW_ROOT . 'company');
         $folder->delete();
     }
+
+    /**
+     * testCopyOverwrite
+     *
+     * @return void
+     */
+    public function testCopyOverwrite()
+    {
+        Plugin::load('TestPlugin');
+
+        $this->Task->copy();
+
+        $path = WWW_ROOT . 'test_plugin';
+        $dir = new \SplFileInfo($path);
+        $this->assertTrue($dir->isDir());
+        $this->assertFileExists($path . DS . 'root.js');
+
+        unlink($path . DS . 'root.js');
+
+        $this->Task->copy();
+
+        $this->assertFileNotExists($path . DS . 'root.js');
+
+        $this->Task->params['overwrite'] = true;
+        $this->Task->copy();
+
+        $this->assertFileExists($path . DS . 'root.js');
+
+        $folder = new Folder($path);
+        $folder->delete();
+    }
 }