Constraints on massive astrophysical compact halo objects (MACHOs) as a form of dark matter, based on the velocity distributions in Eridanus 2. For each combination of MACHO mass m_M and the fraction f_M of dark matter consisting of MACHOs, the probability of rejection by the observations is indicated, using the fiducial cluster age of 8 Gyr. The red solid contours show where this probability reaches a 68- and 95% level. For dark matter consisting entirely of MACHOs, m_M >  10^0.88 M_⊙ ≈ 7.6 M_⊙ and m_M >  10^1.64 M_⊙ ≈ 44 M_⊙ are ruled out at the 68- and 95% level. The red dashed contours show how the constraints weaken slightly when a lower cluster age of 7 Gyr is assumed.