  Recently, a measurement of the vector-boson scattering process with same-sign
W bosons has been reported by the CMS collaboration. Hence it is of prime
importance to have precise predictions with next-to-leading order (NLO)
accuracy. In these proceedings, we report on a recent NLO electroweak
computation to the full process ${\rm p}{\rm p}\to\mu^+\nu_\mu{\rm e}^+\nu_{\rm
e}{\rm j}{\rm j}$. As realistic experimental event selections are applied to
the final state, it can directly be compared with experimental measurements.
This is particularly important as the corrections turn out to be surprisingly
large and even exceed the NLO QCD corrections. The NLO electroweak predictions
are presented at the cross-section and differential distribution level.
