Employee-driven innovation involves all employees at all levels in improvement work in the organisation. Rather than only accessing the capabilities of research and development employees – the unique competence, insights and ideas of all staff can be activated. We use a longitudinal design to test the impact of leader training on third-level EDI as part of a psychosocial risk assessment process. Leaders are trained to listen to employees and work together to solve work environment problems. We found that idea generation and time to take a break to test new ideas increases after only six months, and this increase is sustained at 18 months compared to a control group. However, 'keenness to share ideas' and 'being listened to' were not significant compared to the control group. These findings and their implications for future research are discussed.