The top panel shows the spin period derivative due to the non-zero proper motion (the Shklovskii effect) as a function of distance as the dashed line. For distances larger than 0.43 kpc, it exceeds the observed spin period derivative (solid horizontal line). The histogram on the right-hand side of the top panel shows the distribution of intrinsic spin period derivatives for all radio millisecond pulsars in the Galactic field (Manchester et al. 2005). The bottom panel shows the radial acceleration required to explain the observed spin period derivative of PSR J1024−0719 given the Shklovskii contribution assuming four different values for the intrinsic spin period derivative of the pulsar. The solid and dashed vertical lines denote the Lutz & Kelker (1973) bias corrected distance of PSR J1024−0719 derived from our parallax measurement.