Index: wp-includes/class-wp-theme.php
===================================================================
--- wp-includes/class-wp-theme.php	(revision 21499)
+++ wp-includes/class-wp-theme.php	(working copy)
@@ -814,7 +814,7 @@
 		else
 			$theme_root_uri = $this->get_theme_root_uri();
 
-		return $theme_root . '/' . $this->template;
+		return $theme_root_uri . '/' . $this->template;
 	}
 
 	/**