diff --git a/lessify.inc.php b/lessify.inc.php
index 96d7d2a9..0f34f988 100644
--- a/lessify.inc.php
+++ b/lessify.inc.php
@@ -363,7 +363,7 @@ public function dump() {
 		print_r($this->env);
 	}
 
-	public function parse($str = null) {
+	public function parse($str = null, $initialVariables = null) {
 		$this->prepareParser($str ? $str : $this->buffer);
 		while (false !== $this->parseChunk());