diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index 45e91cb..6f635bd 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -222,7 +222,7 @@
 	 */
 	public function affected_rows()
 	{
-		return @odbc_num_rows($this->conn_id);
+		return @odbc_num_rows($this->result_id);
 	}
 
 	// --------------------------------------------------------------------