diff --git a/mysql-test/main/alter_table_online_debug.result b/mysql-test/main/alter_table_online_debug.result
index cf72d2dede0..9f95f012967 100644
--- a/mysql-test/main/alter_table_online_debug.result
+++ b/mysql-test/main/alter_table_online_debug.result
@@ -1210,6 +1210,27 @@ set debug_sync= 'now signal goon';
 connection default;
 drop table t;
 drop function f;
+# Partitioning
+create or replace table t1 (a serial);
+insert t1 values (5), (6), (7);
+set debug_sync= 'alter_table_online_downgraded SIGNAL downgraded wait_for goon';
+alter table t1 ENGINE=InnoDB, ALGORITHM=COPY, LOCK=NONE
+PARTITION BY HASH(a) PARTITIONS 5;
+connection con1;
+set debug_sync= 'now WAIT_FOR downgraded';
+insert into t1 values (123), (456), (789);
+update t1 set a= a+100;
+set debug_sync= 'now SIGNAL goon';
+connection default;
+select * from t1;
+a
+105
+106
+556
+107
+223
+889
+drop table t1;
 disconnect con1;
 #
 # End of 11.2 tests
diff --git a/mysql-test/main/alter_table_online_debug.test b/mysql-test/main/alter_table_online_debug.test
index 47e0a7b23e5..b7938a70210 100644
--- a/mysql-test/main/alter_table_online_debug.test
+++ b/mysql-test/main/alter_table_online_debug.test
@@ -2,6 +2,7 @@
 --source include/not_embedded.inc
 --source include/binlog_combinations.inc
 --source include/have_innodb.inc
+--source include/have_partition.inc
 set default_storage_engine= innodb;
 
 --connect (con2, localhost, root,,)
@@ -1396,8 +1397,28 @@ set debug_sync= 'now signal goon';
 --reap
 drop table t;
 drop function f;
---disconnect con1
 
+--echo # Partitioning
+create or replace table t1 (a serial);
+insert t1 values (5), (6), (7);
+
+set debug_sync= 'alter_table_online_downgraded SIGNAL downgraded wait_for goon';
+send alter table t1 ENGINE=InnoDB, ALGORITHM=COPY, LOCK=NONE
+                    PARTITION BY HASH(a) PARTITIONS 5;
+
+--connection con1
+set debug_sync= 'now WAIT_FOR downgraded';
+insert into t1 values (123), (456), (789);
+update t1 set a= a+100;
+set debug_sync= 'now SIGNAL goon';
+
+--connection default
+--reap
+select * from t1;
+
+drop table t1;
+
+--disconnect con1
 --echo #
 --echo # End of 11.2 tests
 --echo #