1 files changed, 2 insertions, 2 deletions
diff --git a/library/std/src/sys/unix/kernel_copy.rs b/library/std/src/sys/unix/kernel_copy.rs
index 16c8e0c0e..7d49bbdcb 100644
--- a/library/std/src/sys/unix/kernel_copy.rs
+++ b/library/std/src/sys/unix/kernel_copy.rs
@@ -466,7 +466,7 @@ impl<T: CopyRead> CopyRead for Take<T> {
     }
 }
 
-impl<T: CopyRead> CopyRead for BufReader<T> {
+impl<T: ?Sized + CopyRead> CopyRead for BufReader<T> {
     fn drain_to<W: Write>(&mut self, writer: &mut W, outer_limit: u64) -> Result<u64> {
         let buf = self.buffer();
         let buf = &buf[0..min(buf.len(), outer_limit.try_into().unwrap_or(usize::MAX))];
@@ -495,7 +495,7 @@ impl<T: CopyRead> CopyRead for BufReader<T> {
     }
 }
 
-impl<T: CopyWrite> CopyWrite for BufWriter<T> {
+impl<T: ?Sized + CopyWrite> CopyWrite for BufWriter<T> {
     fn properties(&self) -> CopyParams {
         self.get_ref().properties()
     }