The study examines use of evidentiality in the Turkish language, which requires the activation of the morphology-pragmatics interface, by Russian L1 immigrants, who are advanced L2 users of Turkish. The data were collected via using a narrative, discourse completion and grammaticality judgement task. Quantitative and qualitative inter-group analyses were conducted. The findings have revealed that the use of Turkish evidential markers of the Russian immigrant group shows differences in their use and grammaticality judgement of evidentiality in Turkish when they are compared with native Turkish speakers. Our findings suggest that evidentiality in Turkish is challenging even for advanced L2 users.