Ground-based and Gaia data sets used for the modelling, photometrically aligned to the I_OGLE magnitude. Left: light curve observed from Earth and Gaia, along with finite source models, with (black solid line) and without (black dashed line) parallax. As the Gaia satellite is located close to Earth, the observed magnification is very similar in both cases. Right: peak of the event with finite source effects clearly visible, along with residuals from the model. The shape of the light curve as seen from the position of Gaia is slightly different. The importance of the intensive ground-based follow-up campaign is highlighted here. The survey data (OGLE and Gaia) were sufficient to estimate standard microlensing parameters, while the high-cadence observations were vital to cover the peak and constrain the size of the source.