diff --git a/db/mongo.php b/db/mongo.php
index d26d1676..0d460de8 100644
--- a/db/mongo.php
+++ b/db/mongo.php
@@ -78,7 +78,7 @@ function log($flag=TRUE) {
 						PHP_EOL;
 		} else {
 			$this->log=FALSE;
-			if ($legacy)
+			if ($this->legacy)
 				$this->db->setprofilinglevel(-1);
 			else
 				$this->db->command(['profile'=>-1]);
@@ -93,7 +93,7 @@ function log($flag=TRUE) {
 	function drop() {
 		$out=$this->db->drop();
 		if ($this->log!==FALSE) {
-			if ($legacy)
+			if ($this->legacy)
 				$this->db->setprofilinglevel(2);
 			else
 				$this->db->command(['profile'=>2]);