The application of turbo coding to non-linear side-informed watermarking schemes is examined. The proposed system is viewed as a serial concatenation of two codes. The outer code is a variable rate turbo code while the inner code involves our previously proposed side-informed embedding scheme which may be understood as a repetition code. For a fixed system code rate, we evaluate the robustness of the proposed scheme, in terms of bit error rate (BER), when subjected to a number of attacks. The performance is compared with another side-informed embedding scheme, spread-transform dither modulation (ST-DM) in the case of both additive and amplitude scaling attacks.