  We study the ordinary differential equation $\varepsilon\ddot x + \dot x +
\varepsilon g(x) = \e f(\omega t)$, where $g$ and $f$ are real-analytic
functions, with $f$ quasi-periodic in $t$ with frequency vector $\omega$. If
$c_{0} \in \mathbb{R}$ is such that $g(c_0)$ equals the average of $f$ and
$g'(c_0)\neq0$, under very mild assumptions on $\omega$ there exists a
quasi-periodic solution close to $c_0$. We show that such a solution depends
analytically on $\varepsilon$ in a domain of the complex plane tangent more
than quadratically to the imaginary axis at the origin.
