diff --git a/.gitlab/scripts/dut-init/cdrouter-dut-flush-dns-relay-cache.sh b/.gitlab/scripts/dut-init/cdrouter-dut-flush-dns-relay-cache.sh
index a5ce0f64ac..2660bb9c23 100755
--- a/.gitlab/scripts/dut-init/cdrouter-dut-flush-dns-relay-cache.sh
+++ b/.gitlab/scripts/dut-init/cdrouter-dut-flush-dns-relay-cache.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
 
 ssh "root@$TARGET_LAN_IP" "ubus -t 180 wait_for DNS.Relay.Config.1"
+ssh "root@$TARGET_LAN_IP" "ba-cli 'DNS.Relay.Config.[Alias==\"lo\"].FlushCache()'"
 ssh "root@$TARGET_LAN_IP" "ba-cli 'DNS.Relay.Config.[Alias==\"lan\"].FlushCache()'"