The sublimation enthalpy of cubane, a key reference material for force field and quantum mechanical computations, was measured by combining the vaporization enthalpy at T = 298.15K to the sum of the fusion enthalpy measured at T = 405K and a solid-solid phase transition that occurs at T = 394K. The fusion and solid-solid phase transitions were measured previously. A sublimation enthalpy value of (55.2 +/- 2.0) kJmol - 1 at T = 298.15K was obtained. This value compares quite favorably the value obtained by comparing the sublimation enthalpy of similar substances as a function of their molar masses but is at odds with earlier measurements.