diff --git a/src/Filter/Uglifyjs.php b/src/Filter/Uglifyjs.php
index 4dbcf407..f587512c 100644
--- a/src/Filter/Uglifyjs.php
+++ b/src/Filter/Uglifyjs.php
@@ -32,6 +32,18 @@ class Uglifyjs extends AssetFilter
         'options' => '',
     );
 
+    /**
+     * Input filter.
+     *
+     * @param string $filename Name of the file
+     * @param string $content Content of the file.
+     * @return string
+     */
+    public function input($filename, $content)
+    {
+        $this->files[] = $filename;
+        return $content;
+    }
     /**
      * Run `uglifyjs` against the output and compress it.
      *
@@ -41,8 +53,14 @@ class Uglifyjs extends AssetFilter
      */
     public function output($filename, $input)
     {
-        $cmd = $this->_settings['node'] . ' ' . $this->_settings['uglify'] . ' - ' . $this->_settings['options'];
+        $files = implode(' ', $this->files);
+        $cmd =
+            $this->_settings['node'] . ' ' .
+            $this->_settings['uglify'] . ' ' .
+            $files . ' ' .
+            $this->_settings['options'];
+
         $env = array('NODE_PATH' => $this->_settings['node_path']);
-        return $this->_runCmd($cmd, $input, $env);
+        return $this->_runCmd($cmd, '', $env);
     }
 }