Erratum to: “On the formal arc space of a reductive monoid”

We correct the calculation of IC functions on arc spaces of reductive monoids in [Bouthier, Ng\^o, and Sakellaridis, {\it Amer. J. Math.} {\bf 138} (2016), 81--108] which did not account for a Tate twist, corresponding to a shift in the pertinent $L$-function.