diff --git a/lib/mysql.js b/lib/mysql.js
index 135e448..6b641e2 100644
--- a/lib/mysql.js
+++ b/lib/mysql.js
@@ -499,7 +499,7 @@ MySQL.prototype._buildWhere = function (model, conds) {
           sqlCond += ' NOT IN ';
           break;
         case 'neq':
-          sqlCond += ' != ';
+          sqlCond += val === 'NULL' ? ' IS NOT ' : ' != ';
           break;
         case 'like':
           sqlCond += ' LIKE ';