diff --git a/localtests/alter-charset/create.sql b/localtests/alter-charset/create.sql
index e2861d1..e473073 100644
--- a/localtests/alter-charset/create.sql
+++ b/localtests/alter-charset/create.sql
@@ -1,7 +1,8 @@
 drop table if exists gh_ost_test;
 create table gh_ost_test (
   id int auto_increment,
-  t varchar(128)  charset latin1 collate latin1_swedish_ci,
+  t1 varchar(128)  charset latin1 collate latin1_swedish_ci,
+  t2 varchar(128)  charset latin1 collate latin1_swedish_ci,
   tutf8 varchar(128) charset utf8,
   tutf8mb4 varchar(128) charset utf8mb4,
   primary key(id)
@@ -17,7 +18,7 @@ create event gh_ost_test
   enable
   do
 begin
-  insert into gh_ost_test values (null, md5(rand()), md5(rand()), md5(rand()));
-  insert into gh_ost_test values (null, 'átesting', 'átesting', 'átesting');
-  insert into gh_ost_test values (null, 'testátest', 'testátest', '🍻😀');
+  insert into gh_ost_test values (null, md5(rand()), md5(rand()), md5(rand()), md5(rand()));
+  insert into gh_ost_test values (null, 'átesting', 'átesting', 'átesting', 'átesting');
+  insert into gh_ost_test values (null, 'testátest', 'testátest', 'testátest', '🍻😀');
 end ;;
diff --git a/localtests/alter-charset/extra_args b/localtests/alter-charset/extra_args
index 29e526e..c39b022 100644
--- a/localtests/alter-charset/extra_args
+++ b/localtests/alter-charset/extra_args
@@ -1 +1 @@
---alter='MODIFY `t` varchar(128) CHARACTER SET utf8mb4 NOT NULL' 
+--alter='MODIFY `t1` varchar(128) CHARACTER SET utf8mb4 NOT NULL, MODIFY `t2` varchar(128) CHARACTER SET latin2 NOT NULL, MODIFY `tutf8` varchar(128) CHARACTER SET latin1 NOT NULL'