diff --git a/dm/tests/_utils/run_tidb_server b/dm/tests/_utils/run_tidb_server
index 20f82605ff6..cde1e60629e 100755
--- a/dm/tests/_utils/run_tidb_server
+++ b/dm/tests/_utils/run_tidb_server
@@ -47,3 +47,4 @@ done
 # if user test is already exist, add || true to avoid exit with 2
 mysql -uroot -h127.0.0.1 -P${PORT} --default-character-set utf8 -e "CREATE USER 'test'@'%' IDENTIFIED BY '$PASSWORD';" || true
 mysql -uroot -h127.0.0.1 -P${PORT} --default-character-set utf8 -e "GRANT ALL PRIVILEGES ON *.* TO 'test'@'%' WITH GRANT OPTION;" || true
+mysql -uroot -h127.0.0.1 -P${PORT} --default-character-set utf8 -e "SET @@global.tidb_enable_clustered_index = 'INT_ONLY'"
diff --git a/dm/tests/shardddl3/run.sh b/dm/tests/shardddl3/run.sh
index 236488241dd..325cf6716ef 100644
--- a/dm/tests/shardddl3/run.sh
+++ b/dm/tests/shardddl3/run.sh
@@ -126,7 +126,7 @@ function DM_079_CASE() {
 
 	run_dm_ctl_with_retry $WORK_DIR "127.0.0.1:$MASTER_PORT" \
 		"query-status test" \
-		"Unsupported drop primary key when the table's pkIsHandle is true" 1
+		"Unsupported drop primary key" 1
 }
 
 function DM_079() {