diff --git a/mysql-test/r/partition_alter.result b/mysql-test/r/partition_alter.result
index cbd90b5ba7c..4aea0045617 100644
--- a/mysql-test/r/partition_alter.result
+++ b/mysql-test/r/partition_alter.result
@@ -51,3 +51,44 @@ execute stmt;
 execute stmt;
 deallocate prepare stmt;
 drop table test_data;
+create table t1(id int, d date not null, b bool not null default 0, primary key(id,d))
+engine=innodb
+partition by range columns (d) (
+partition p1 values less than ('2016-10-18'),
+partition p2 values less than ('2020-10-19'));
+insert t1 values (0, '2000-01-02', 0);
+insert t1 values (1, '2020-01-02', 10);
+alter table t1 add check (b in (0, 1));
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL,
+  `d` date NOT NULL,
+  `b` tinyint(1) NOT NULL DEFAULT '0',
+  PRIMARY KEY (`id`,`d`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+/*!50500 PARTITION BY RANGE  COLUMNS(d)
+(PARTITION p1 VALUES LESS THAN ('2016-10-18') ENGINE = InnoDB,
+ PARTITION p2 VALUES LESS THAN ('2020-10-19') ENGINE = InnoDB) */
+insert t1 values (2, '2020-01-03', 20);
+drop table t1;
+create table t1(id int, d date not null, b bool not null default 0, primary key(id,d))
+partition by range columns (d) (
+partition p1 values less than ('2016-10-18'),
+partition p2 values less than ('2020-10-19'));
+insert t1 values (0, '2000-01-02', 0);
+insert t1 values (1, '2020-01-02', 10);
+alter table t1 add check (b in (0, 1));
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL,
+  `d` date NOT NULL,
+  `b` tinyint(1) NOT NULL DEFAULT '0',
+  PRIMARY KEY (`id`,`d`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+/*!50500 PARTITION BY RANGE  COLUMNS(d)
+(PARTITION p1 VALUES LESS THAN ('2016-10-18') ENGINE = MyISAM,
+ PARTITION p2 VALUES LESS THAN ('2020-10-19') ENGINE = MyISAM) */
+insert t1 values (2, '2020-01-03', 20);
+drop table t1;
diff --git a/mysql-test/t/partition_alter.test b/mysql-test/t/partition_alter.test
index 592d8fdaeaa..2f3c2a319fb 100644
--- a/mysql-test/t/partition_alter.test
+++ b/mysql-test/t/partition_alter.test
@@ -1,3 +1,4 @@
+--source include/have_innodb.inc
 --source include/have_partition.inc
 
 CREATE TABLE `test_data` (
@@ -64,3 +65,41 @@ deallocate prepare stmt;
 
 drop table test_data;
 
+#
+# MDEV-12389 ADD CHECK leaves an orphaned .par file
+#
+
+--let $datadir=`SELECT @@datadir`
+
+# InnoDB
+create table t1(id int, d date not null, b bool not null default 0, primary key(id,d))
+engine=innodb
+partition by range columns (d) (
+partition p1 values less than ('2016-10-18'),
+partition p2 values less than ('2020-10-19'));
+insert t1 values (0, '2000-01-02', 0);
+insert t1 values (1, '2020-01-02', 10);
+# should fail in 10.2
+alter table t1 add check (b in (0, 1));
+# should have CHECK in 10.2
+show create table t1;
+# should fail in 10.2
+insert t1 values (2, '2020-01-03', 20);
+drop table t1;
+--list_files $datadir/test
+
+# MyISAM, different execution path
+create table t1(id int, d date not null, b bool not null default 0, primary key(id,d))
+partition by range columns (d) (
+partition p1 values less than ('2016-10-18'),
+partition p2 values less than ('2020-10-19'));
+insert t1 values (0, '2000-01-02', 0);
+insert t1 values (1, '2020-01-02', 10);
+# should fail in 10.2
+alter table t1 add check (b in (0, 1));
+# should have CHECK in 10.2
+show create table t1;
+# should fail in 10.2
+insert t1 values (2, '2020-01-03', 20);
+drop table t1;
+--list_files $datadir/test
diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index 57fa732251f..db0d6d4f377 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -8856,7 +8856,9 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
 
          TODO don't create the frm in the first place
       */
-      deletefrm(alter_ctx.get_tmp_path());
+      const char *path= alter_ctx.get_tmp_path();
+      table->file->ha_create_partitioning_metadata(path, NULL, CHF_DELETE_FLAG);
+      deletefrm(path);
       my_free(const_cast<uchar*>(frm.str));
       goto end_inplace;
     }