Motorbike-based ride-hailing services are widespread in many of the most congested cities in the developing world. These services often predate the construction of modern public mass rapid transit systems. Ride-hailing services may complement such investments by providing important first and last mile connectivity. However, it has also been argued that they undermine the viability of mass rapid transit systems as people prefer to use ride-hailing services given their convenience and low prices. This paper applies an event study research design to proprietary, high-frequency data from one of Indonesia’s largest ride-hailing services, Gojek. The findings show that the opening of stations on Jakarta’s first mass rapid transit line led to large increases in ride-hailing activity in the immediate vicinities of the sta￾tions. This was accompanied by a significant decline in the average distance of ride-hailing trips to and from the station locations. These findings are consistent with ride-hailing services complementing public transport by providing first and last mile connectivity to the newly opened mass rapid transit system. Interestingly, this holds for both commuting and non-commuting trips and is strongest for mass rapid transit station locations that were not already served by Jakarta’s bus rapid transit system.