diff --git a/includes/db/Database.php b/includes/db/Database.php
index fe31766c9ea..4c151d7a1c9 100644
--- a/includes/db/Database.php
+++ b/includes/db/Database.php
@@ -1445,15 +1445,15 @@ abstract class DatabaseBase {
 	 */
 
 	function bitNot($field) {
-		return '~'.$bitField;
+		return "(~$bitField)";
 	}
 
 	function bitAnd($fieldLeft, $fieldRight) {
-		return $fieldLeft.'&'.$fieldRight;
+		return "($fieldLeft & $fieldRight)";
 	}
 
 	function bitOr($fieldLeft, $fieldRight) {
-		return $fieldLeft.'|'.$fieldRight;
+		return "($fieldLeft | $fieldRight)";
 	}
 
 	/**