  Considering single-meson photo- and electroproduction off a baryon, it is
shown how to restore local gauge invariance that was broken by replacing
standard Feynman-type meson exchange in the t-channel by exchange of a Regge
trajectory. This is achieved by constructing a contact current whose
four-divergence cancels the gauge-invariance-violating contributions resulting
from all states above the base state on the Regge trajectory. To illustrate the
procedure, modifications necessary for the process $\gamma +p \to K^+ +
\Sigma^{*0}$ are discussed in some detail. We also provide the general
expression for the contact current for an arbitrary reaction.
