diff --git a/lessc.inc.php b/lessc.inc.php
index 2292f219..550954b4 100644
--- a/lessc.inc.php
+++ b/lessc.inc.php
@@ -1888,6 +1888,7 @@ public function compile($string, $name = null) {
 
 		$this->env = null;
 		$this->scope = null;
+		$this->allParsedFiles = array();
 
 		$this->formatter = $this->newFormatter();