In this paper, we study the additive complexity $ρ^{+}_{\mathbf{t}}(n)$ of a Thue-Morse like sequence $\mathbf{t}=σ^{\infty}(0)$ with the morphism $σ: 0\to 01, 1\to 12, 2\to 20$. We show that $ρ^{+}_{\mathbf{t}}(n)=2\lfloor\log_2(n)\rfloor+3$ for all integers $n\geq 1$. Consequently, $(ρ_{\mathbf{t}}(n))_{n\geq 1}$ is a $2$-regular sequence.
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