Speaker's good pronunciation makes his/her listener comfortable, and confident to participate in the conversation and his/her mispronunciations bring implications to the listener's awareness and involvement with the message spoken. The research was aimed at detecting the mispronunciations produced by 70 nonnative (L2) post-graduate students who were enrolled in the English department. They were given English texts to read, recorded, and a semi-structured interview was applied. Error analysis was employed to check mispronunciations. The results showed that 43 students (61%) made mispronunciations and 27 (39%) had good pronunciations. Mispronunciation was found on vowels by 4 students (5.71%), on consonants by 5 (7.14%), on diphthongs by 3 (4.28%), and on consonant clusters by 14 (20%). Most of the students did intralingual and global errors which can influence their pronunciation quality and their bad quality bring bad impacts to their school children.