  In this paper, we prove that if $K$ is an $o$-symmetric cylinder and $L$ is
an $o$-symmetric convex body in $\mathbb R^3$, then the logarithmic Minkowski
inequality \[\frac{1}{V(K)}\int_{\mathbb
S^{2}}\log\frac{h_L}{h_K}\,dV_K\geq\frac{1}{3}\log\frac{V(L)}{V(K)}\] holds,
with equality if and only if $K$ and $L$ are relative cylinders.
