Humans are able to speak in synchrony with each other. The present study investigated whether four temporal correlates of speech rhythm (%V, nPVI-C, nPVI-V, nPVI-CV) adapt when speaking in synchrony with a recording. The experimental setting consisted of three conditions: Eight participants read three sentences out loud (read), four of them were asked to speak in synchrony (sync) with the same sentences recorded by the four others (target). Correlation analysis was carried out between the rhythmic measurements of the sync condition and the two others (read/target). Results revealed that there are typically strong significant correlations between speech rhythm of the read and synchronous speech. The impact on speaker identification, in particular under forensic circumstances, is discussed.