Aim of this research is to examine the predictive power of attachment style on problematic internet use among university students. Participants of study consist of 481 university students (230 girls). Results indicate that there is a negative correlation between secure attachment style and social benefit/social comfort and there is a positive correlation between preoccupied attachment style and social benefit/social comfort which is a sub-dimension of problematic internet use. Considering predictive power of attachment on problematic internet use, results show that preoccupied, secure and dismissing attachment styles are significant predictors of social benefit/social comfort. Results and comments for the future studies on problematic internet use and attachment were discussed in general.