  We investigate the eventual sign changing for the solutions of the linear
equation $\left(x^{(\alpha)}\right)^{\prime}+q(t)x=0$, $t\geq0$, when the
functional coefficient $q$ satisfies the Kamenev-type restriction
$\limsup\limits_{t\rightarrow+\infty}\frac{1}{t^{\varepsilon}}\int_{t_0}^{t}(t-s)^{\varepsilon}q(s)ds=+\infty$
for some $\varepsilon>2$, $t_{0}>0$. The operator $x^{(\alpha)}$ is the Caputo
differential operator and $\alpha\in(0,1)$.
