diff --git a/lessc.inc.php b/lessc.inc.php
index 2f407c7f..c97364e9 100644
--- a/lessc.inc.php
+++ b/lessc.inc.php
@@ -52,7 +52,7 @@ class lessc {
 	public $parentSelector = '&';
 
 	public $importDisabled = false;
-	public $importDir = '';
+	public $importDir = array();
 
 	protected $numberPrecision = null;