diff --git a/bench/src/bench.rs b/bench/src/bench.rs
index 3f25438..b6687f4 100644
--- a/bench/src/bench.rs
+++ b/bench/src/bench.rs
@@ -244,9 +244,10 @@ fn sentences(c: &mut Criterion) {
 fn byte_lines(c: &mut Criterion) {
     use bstr::io::BufReadExt;
 
-    let mut corpus = SUBTITLE_EN_HUGE;
+    let corpus = SUBTITLE_EN_HUGE;
     define(c, "bstr/for_byte_line", "ascii", corpus, move |b| {
         b.iter(|| {
+            let mut corpus = corpus;
             let mut count = 0;
             corpus
                 .for_byte_line(|line| {