  We present results on interferometry correlations for pions emitted in
central p+Pb collisions at 5.02TeV in a 3+1 dimensional viscous hydrodynamic
model with initial conditions from the Glauber Monte Carlo model. The
correlation function is calculated as a function of the pion pair rapidity. The
extracted interferometry radii show a weak rapidity dependence, reflecting the
lack of boost invariance of the pion distribution. A cross-term between the
$out$ and $long$ directions is found to be nonzero. The results obtained in the
hydrodynamic model are in fair agreement with recent data of the ATLAS
Collaboration.
