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SN 2014C was an unusual supernova that initially had Type Ib optical spectrum, but after $t = 130$ d it developed a Type IIn spectrum with prominent H$\\alpha$ lines, suggesting the onset of strong circumstellar interaction. Our first VLBI observation was at $t = 384$ d, and we find that the outer radius of SN 2014C was $(6.40 \\pm 0.26) \\times 10^{16}$ cm (for a distance of 15.1 Mpc), implying an average expansion velocity of $19300 \\pm 790$ \\kms\\ up to that time. 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