diff --git a/system/asset.php b/system/asset.php
index d0e6f876..0bfecdf7 100644
--- a/system/asset.php
+++ b/system/asset.php
@@ -122,7 +122,9 @@ class Asset_Container {
 	 */
 	public function add($name, $source, $dependencies = array(), $attributes = array())
 	{
-		$type = (File::extension($source) == 'css') ? 'style' : 'script';
+		$_source = explode('?', $source);
+
+		$type = (File::extension($_source[0]) == 'css') ? 'style' : 'script';
 
 		return call_user_func(array($this, $type), $name, $source, $dependencies, $attributes);
 	}