--- mariadb-10.2.12/libmariadb/plugins/auth/my_auth.c.orig	2018-01-03 14:48:27.000000000 +0100
+++ mariadb-10.2.12/libmariadb/plugins/auth/my_auth.c	2018-01-17 12:54:20.585991698 +0100
@@ -515,7 +515,7 @@
     else
     {
       if (!(auth_plugin= (auth_plugin_t*)mysql_client_find_plugin(mysql,
-                         "old_password", MYSQL_CLIENT_AUTHENTICATION_PLUGIN)))
+                         "mysql_old_password", MYSQL_CLIENT_AUTHENTICATION_PLUGIN)))
         return 1; /* not found */
     }
     auth_plugin_name= auth_plugin->name;