diff --git a/mysql-test/suite/perfschema/r/mdl_func.result b/mysql-test/suite/perfschema/r/mdl_func.result
index 4887b15efa5..f3fc0d10a96 100644
--- a/mysql-test/suite/perfschema/r/mdl_func.result
+++ b/mysql-test/suite/perfschema/r/mdl_func.result
@@ -1,3 +1,4 @@
+# restart
 UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
 UPDATE performance_schema.setup_instruments SET enabled = 'YES'
 WHERE name in ('wait/io/table/sql/handler',
diff --git a/mysql-test/suite/perfschema/t/mdl_func.test b/mysql-test/suite/perfschema/t/mdl_func.test
index c7f5585a5c2..209c2f112af 100644
--- a/mysql-test/suite/perfschema/t/mdl_func.test
+++ b/mysql-test/suite/perfschema/t/mdl_func.test
@@ -1,5 +1,11 @@
 --source include/not_embedded.inc
 --source include/have_perfschema.inc
+# This test needs a fresh restart. The table performance_schema.table_handles
+# can otherwise contain extra rows left from previous testcases.
+# For example the test case main.long_unique_delayed, which uses
+# INSERT DELAYED, will leave extra rows in this table if run just before this
+# test, causing .result diff failure.
+--source include/restart_mysqld.inc
 
 UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';