This study examined whether mastery-oriented learners have proper perception of the effectiveness of motivational regulation strategies. Self-reported data on achievement goals and motivational regulation strategies were obtained from 80 university students. First, we confirmed that learners' misperception of effectiveness was an obstacle to proper use of motivational regulation strategies. Thereafter, the results showed that mastery goal orientation was positively related to proper perception of the effectiveness of motivational regulation strategies. These results helped us understand why mastery-oriented learners can use effective motivational regulation strategies.