Turrets and Xin Zhao's W-

I'm fairly certain the passive healing on Xin Zhao's W (Battle Cry) works on turrets. I just built sated devourer, Nashor's tooth, and Guinsoo's Rageblade, and dove a Lee Sin and Kat. After killing them both, I waited behind the turret for a minion wave, and once it came I started attacking the turret. Every third hit on the turret, I gained about a quarter of my max health back. Most forms of lifesteal/recovery don't apply to structures or wards any longer so this seems like an odd exception. Intended or nah?

Disclaimer: this was on Japan server, so I'm not sure if it applies to NA too.