Wikis provide users with opportunities to post and edit messages to collaborate in the language learning process. Many studies have offered findings to show positive impact of Wiki-based language learning for learners. This paper explores the effect of collaborative task in error correction for English as a Foreign Language learning in an online (Wiki) language exchange programme (Chinese and English) between China and the UK. The current study was conducted with students studying an English module at an international university, China. They worked with students studying a Chinese language course at a university in the UK on a collaborative writing project. The results indicate that learners provided positive comments on using Wikis for collaborative learning to practise their language skills, particularly with specifically designed tasks integrated into their language courses. Students enjoyed correcting language errors for each other on the Wiki. In addition, the results suggest that students improved their writing skills.