  Gamma-ray observations provide sensitive tests of Lorentz invariance
violation (LIV). At present the most sensitive tests come from observations of
transient events, gamma-ray bursts and flaring AGN. Disadvantages of transients
are that an independent confirmation by a different experiment is often not
possible and that limits cannot be improved with a longer exposure. Pulsars do
not have these disadvantages. Testing Lorentz invariance with pulsars was not
considered seriously so far because limits were not competitive. The VERITAS
collaboration has recently reported the detection of pulsed emission from the
Crab pulsar above 100 GeV. This measurement can be used to constrain LIV
effects with a sensitivity that is competitive with some of the best available
limits. In view of this unexpected result we discuss what the prospects are of
doing LIV tests with very-high energy gamma-ray emission from pulsars.
