diff --git a/mysql-test/r/func_misc.result b/mysql-test/r/func_misc.result
index 10d20c001f1..f383a717a85 100644
--- a/mysql-test/r/func_misc.result
+++ b/mysql-test/r/func_misc.result
@@ -87,6 +87,10 @@ SELECT IS_USED_LOCK('bug16501');
 IS_USED_LOCK('bug16501')
 NULL
 DROP TABLE t1;
+select export_set(3, _latin1'foo', _utf8'bar', ',', 4);
+export_set(3, _latin1'foo', _utf8'bar', ',', 4)
+foo,foo,bar,bar
+End of 4.1 tests
 create table t1 as select uuid(), length(uuid());
 show create table t1;
 Table	Create Table
@@ -130,3 +134,4 @@ timediff(b, a) >= '00:00:03'
 drop table t2;
 drop table t1;
 set global query_cache_size=default;
+End of 5.0 tests
diff --git a/mysql-test/t/func_misc.test b/mysql-test/t/func_misc.test
index 0475dd4bdb6..52a5512d070 100644
--- a/mysql-test/t/func_misc.test
+++ b/mysql-test/t/func_misc.test
@@ -78,7 +78,13 @@ connection default;
 
 DROP TABLE t1;
 
-# End of 4.1 tests
+#
+# Bug #21531: EXPORT_SET() doesn't accept args with coercible character sets
+#
+select export_set(3, _latin1'foo', _utf8'bar', ',', 4);
+
+--echo End of 4.1 tests
+
 
 #
 # Test for BUG#9535
@@ -87,7 +93,9 @@ create table t1 as select uuid(), length(uuid());
 show create table t1;
 drop table t1;
 
+#
 # Bug #6760: Add SLEEP() function
+#
 create table t1 (a timestamp default '2005-05-05 01:01:01',
                  b timestamp default '2005-05-05 01:01:01');
 insert into t1 set a = now();
@@ -117,4 +125,4 @@ drop table t2;
 drop table t1;
 set global query_cache_size=default;
 
-# End of 5.0 tests
+--echo End of 5.0 tests