We examine the influence of trust on the formation of social network ties for the idea generation and idea realisation stages of innovation. Drawing on data from 153 employees working in project teams at two firms, we find two dimensions of trustworthiness, Ability and Benevolence, predict tie formation for both idea generation and idea realisation, whereas Integrity predicts tie formation for idea generation only. Moderation analyses across both firms and stages of innovation reveal that a lack of benevolence makes ability largely irrelevant as a criterion for choosing a partner for innovation activities, whereas high benevolence increases the extent to which ability influences partner choice. Additionally, a lack of integrity makes ability either irrelevant or a negative criterion for partner section. Overall the results suggest that people need to perceive others as benevolent and not lacking in integrity in order to seek out their skills and knowledge for innovation in project teams.