diff --git a/app/fax_queue/resources/service/fax_queue.php b/app/fax_queue/resources/service/fax_queue.php
index 2f949030fc..98a4e4c1cc 100644
--- a/app/fax_queue/resources/service/fax_queue.php
+++ b/app/fax_queue/resources/service/fax_queue.php
@@ -147,7 +147,7 @@
 	}
 
 //change the working directory
-	chdir($document_root);
+	chdir($_SERVER['DOCUMENT_ROOT']);
 
 //get the messages waiting in the email queue
 	while (true) {
@@ -193,7 +193,7 @@
 		//process the messages
 			if (is_array($fax_queue) && @sizeof($fax_queue) != 0) {
 				foreach($fax_queue as $row) {
-					$command = exec('which php')." ".$document_root."/app/fax_queue/resources/job/fax_send.php ";
+					$command = exec('which php')." ".$_SERVER['DOCUMENT_ROOT']."/app/fax_queue/resources/job/fax_send.php ";
 					$command .= "'action=send&fax_queue_uuid=".$row["fax_queue_uuid"]."&hostname=".$hostname."'";
 					if (isset($debug)) {
 						//run process inline to see debug info