diff --git a/lib/src/questions.rs b/lib/src/questions.rs
index 6fd27f7..48b3489 100644
--- a/lib/src/questions.rs
+++ b/lib/src/questions.rs
@@ -106,7 +106,7 @@ impl From<SourceQuestionsBatch> for Vec<Question> {
             .map(|item| item.clone().into())
             .collect();
         let batch_info = BatchInfo::from(src);
-        result.iter_mut().for_each(|mut question| {
+        result.iter_mut().for_each(|question| {
             question.batch_info = batch_info.clone();
         });