diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index 0da0b442946..9c2c491616b 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -2665,6 +2665,7 @@ server_option:
           {
             MYSQL_YYABORT_UNLESS(Lex->server_options.host.str == 0);
             Lex->server_options.host= $2;
+            my_casedn_str(system_charset_info, Lex->server_options.host.str);
           }
         | DATABASE TEXT_STRING_sys
           {