diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index daecabe..604dd77 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -41,7 +41,7 @@
 
 	function CI_DB_odbc_driver()
 	{
-		$_random_keyword = ' RND('.time().')'; // database specific random keyword
+		$this->_random_keyword = ' RND('.time().')'; // database specific random keyword
 	}
 
 	/**