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The global survey of star clusters in the Milky Way (MWSC) is a comprehensivelist of 3061 objects that provides, among other parameters, distances toclusters based on isochrone fitting. The Tycho-Gaia Astrometric Solution (TGAS)catalogue, which is a part of Gaia data release 1 (Gaia DR1), delivers accuratetrigonometric parallax measurements for more than 2 million stars, includingthose in star clusters. We compare the open cluster photometric distance scalewith the measurements given by the trigonometric parallaxes from TGAS toevaluate the consistency between these values. The average parallaxes ofprobable cluster members available in TGAS provide the trigonometric distancescale of open clusters, while the photometric scale is given by the distancespublished in the MWSC. Sixty-four clusters are suited for comparison as theyhave more than 16 probable members with parallax measurements in TGAS. Wecomputed the average parallaxes of the probable members and compared these tothe photometric parallaxes derived within the MWSC. We find a good agreementbetween the trigonometric TGAS-based and the photometric MWSC-based distancescales of open clusters, which for distances less than 2.3 kpc coincide at alevel of about 0.1 mas with no dependence on the distance. If at all, there isa slight systematic offset along the Galactic equator between $30^\circ$ and$160^\circ$ galactic longitude.

Open star clusters in the Milky Way - Comparison of photometric and trigonometric distance scales based on Gaia TGAS data