When presented with both non-native and native speech, listeners with a shared language background experience enhanced intelligibility, known as the Interlanguage Speech Intelligibility Benefit (ISIB). This study focuses on Puerto Rican intelligibility when listening to Spanish speakers from four different geographical regions. The results show that transcription accuracy was highest for the Mexican speaker and lowest for the Puerto Rican speaker when background noise was present, which disagrees with the predictions of ISIB.