diff --git a/MysqliDb.php b/MysqliDb.php
index 6a119b6b..53ebd245 100644
--- a/MysqliDb.php
+++ b/MysqliDb.php
@@ -2421,7 +2421,7 @@ public function paginate ($table, $page, $fields = null) {
      */
     public function joinWhere($whereJoin, $whereProp, $whereValue = 'DBNULL', $operator = '=', $cond = 'AND')
     {
-        $this->_joinAnd[$whereJoin][] = Array ($cond, $whereProp, $operator, $whereValue);
+        $this->_joinAnd[self::$prefix . $whereJoin][] = Array ($cond, $whereProp, $operator, $whereValue);
         return $this;
     }