1 files changed, 3 insertions, 3 deletions
diff --git a/library/core/benches/num/flt2dec/mod.rs b/library/core/benches/num/flt2dec/mod.rs
index 32fd5e626bc..1a330ef5fe5 100644
--- a/library/core/benches/num/flt2dec/mod.rs
+++ b/library/core/benches/num/flt2dec/mod.rs
@@ -7,7 +7,7 @@ use core::num::flt2dec::MAX_SIG_DIGITS;
 use core::num::flt2dec::{decode, DecodableFloat, Decoded, FullDecoded};
 use std::io::Write;
 use std::vec::Vec;
-use test::Bencher;
+use test::{black_box, Bencher};
 
 pub fn decode_finite<T: DecodableFloat>(v: T) -> Decoded {
     match decode(v).1 {
@@ -22,7 +22,7 @@ fn bench_small_shortest(b: &mut Bencher) {
 
     b.iter(|| {
         buf.clear();
-        write!(&mut buf, "{}", 3.1415926f64).unwrap()
+        write!(black_box(&mut buf), "{}", black_box(3.1415926f64)).unwrap()
     });
 }
 
@@ -32,6 +32,6 @@ fn bench_big_shortest(b: &mut Bencher) {
 
     b.iter(|| {
         buf.clear();
-        write!(&mut buf, "{}", f64::MAX).unwrap()
+        write!(black_box(&mut buf), "{}", black_box(f64::MAX)).unwrap()
     });
 }