diff --git a/tests/RobotFramework/tests/tedge_agent/workflows/custom_operation.robot b/tests/RobotFramework/tests/tedge_agent/workflows/custom_operation.robot
index c44da0165e1..3dd345df7bd 100644
--- a/tests/RobotFramework/tests/tedge_agent/workflows/custom_operation.robot
+++ b/tests/RobotFramework/tests/tedge_agent/workflows/custom_operation.robot
@@ -37,7 +37,7 @@ Trigger Device Restart
 Trigger Device Restart Using A Sub-Command
     ${pid_before}=  Execute Command    sudo systemctl show --property MainPID tedge-agent
     Execute Command     tedge mqtt pub --retain te/device/main///cmd/restart_sub_command/robot-314 '{"status":"init"}'
-    Should Have MQTT Messages    te/device/main///cmd/restart_sub_command/robot-314    message_pattern=.*successful.*   maximum=1    timeout=300
+    Should Have MQTT Messages    te/device/main///cmd/restart_sub_command/robot-314    message_pattern=.*successful.*   maximum=1    timeout=400
     ${pid_after}=  Execute Command    sudo systemctl show --property MainPID tedge-agent
     Should Not Be Equal    ${pid_before}    ${pid_after}    msg=tedge-agent should have been restarted