  Disorder-free localization is a paradigm of nonergodicity in
translation-invariant quantum many-body systems hosting gauge symmetries. The
quench dynamics starting from simple initial states, which correspond to
extensive superpositions of gauge superselection sectors, exhibits many-body
localization with the system dynamically inducing its own disorder. An open
question concerns the stability of disorder-free localization in the presence
of gauge-breaking errors, and whether processes due to the latter can be
controllably suppressed. Here, we show that translation-invariant
\textit{single-body gauge terms} induce a quantum Zeno effect that reliably
protects disorder-free localization against errors up to times at least
polynomial in the protection strength. Our experimentally feasible scheme not
only shows that disorder-free localization can be reliably stabilized, but also
opens promising prospects for its observation in quantum simulators.
