Despite extensive studies concerning written error correction, it is imperative that more research be conducted to demonstrate the effectiveness of error correction on improving L2 writing. Driven by this gap, this study aimed to examine whether unfocused direct and indirect types of written corrective feedback had any impact on the writing accuracy of the Iranian English language learners’ new compositions. Through the random matching technique, ninety Iranian English language learners from seven foreign language centers in southwestern Iran were split into two groups for treatment and one group for control. As part of the evaluation, a writing test was utilized to determine whether the learners had improved their writing accuracy due to the treatment. The results showed that the participants in both treatment groups improved their writing accuracy, though the learning gains from both treatment were not significantly different. This study concludes with some implications for teachers regarding their use of appropriate types of written error correction.