The corporate entrepreneurship (CE) literature suggests that companies operating in turbulent, hostile and dynamic environments, will exhibit higher levels of entrepreneurial behaviour than their counterparts in more stable environments. Even though the South African business environment has been characterised by turbulence over the past few decades, limited research has been done to empirically test this assertion because of the absence of contextually-validated measurement instruments. This study is an exploratory study reporting on the initial phases to develop a validated instrument to measure managers' perceptions of the enacted environmental antecedents for CE in the South African context. Managers enact their environment, meaning that their entrepreneurial actions are based on perceptions of the business environment shaped by their own interests, and not an objective reality. Based on the empirical results and the assessment of reliability and validity, it is suggested that the 21-item scale offers an initial basis for further refinement of the measurement instrument. The proposed instrument should be useful to researchers and e-business managers to assess managerial perceptions of the enacted corporate entrepreneurship environment.