Using the New Mexico Spanish-English Bilingual Corpus, the present paper examines the variable position of the 1sg Spanish subject pronoun yo-pre-versus post-verbal-to consider the effect that code-switching may have on structural change. In an analysis of close to 700 tokens of yo, a rate of 16% post-positioning is found, which is within the range of post-position in non-contact varieties and thus contraindicative of the convergence hypothesis, in accordance with which the almost exclusive use of preverbal subject pronouns in English would predict lower rates of postverbal yo in a converged contact variety. Moreover, by testing factors hypothesized to account for choice of post-posing yo using multivariate analysis, it is shown that bilinguals display similar constraints on yo post-positioning in New Mexican Spanish as monolingual speakers of Spanish, providing stronger support for an anti-convergence account. Results are discussed in terms of bilingual parallel activation, syntactic priming, and construction grammar.