diff --git a/app/fax_queue/resources/job/fax_queue.php b/app/fax_queue/resources/job/fax_queue.php
index 60a113b21..b08ffcde9 100644
--- a/app/fax_queue/resources/job/fax_queue.php
+++ b/app/fax_queue/resources/job/fax_queue.php
@@ -151,7 +151,7 @@
 //process the messages
 	if (is_array($fax_queue) && @sizeof($fax_queue) != 0) {
 		foreach($fax_queue as $row) {
-			$command = exec('which php')." ".$_SERVER['DOCUMENT_ROOT']."/app/fax_queue/resources/job/fax_send.php ";
+			$command = PHP_BINARY." ".$_SERVER['DOCUMENT_ROOT']."/app/fax_queue/resources/job/fax_send.php ";
 			$command .= "'action=send&fax_queue_uuid=".$row["fax_queue_uuid"]."&hostname=".$hostname."&debug=true'";
 			if (isset($debug)) {
 				//run process inline to see debug info
diff --git a/app/fax_queue/resources/service/fax_queue.php b/app/fax_queue/resources/service/fax_queue.php
index 22df8fd69..6084254eb 100644
--- a/app/fax_queue/resources/service/fax_queue.php
+++ b/app/fax_queue/resources/service/fax_queue.php
@@ -181,7 +181,7 @@
 		//process the messages
 			if (is_array($fax_queue) && @sizeof($fax_queue) != 0) {
 				foreach($fax_queue as $row) {
-					$command = exec('which php')." ".$_SERVER['DOCUMENT_ROOT']."/app/fax_queue/resources/job/fax_send.php ";
+					$command = PHP_BINARY." ".$_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