diff --git a/src/uu/cp/src/platform/linux.rs b/src/uu/cp/src/platform/linux.rs
index 427593ae25d..de02e201e65 100644
--- a/src/uu/cp/src/platform/linux.rs
+++ b/src/uu/cp/src/platform/linux.rs
@@ -214,7 +214,7 @@ fn check_dest_is_fifo(dest: &Path) -> bool {
 }
 
 /// Copy the contents of a stream from `source` to `dest`.
-fn copy_stream<P>(source: P, dest: P) -> std::io::Result<u64>
+fn copy_stream<P>(source: P, dest: P) -> std::io::Result<()>
 where
     P: AsRef<Path>,
 {
@@ -250,10 +250,10 @@ where
         dst_file.set_len(0)?;
     }
 
-    let num_bytes_copied = buf_copy::copy_stream(&mut src_file, &mut dst_file)
+    buf_copy::copy_stream(&mut src_file, &mut dst_file)
         .map_err(|e| std::io::Error::other(format!("{e}")))?;
 
-    Ok(num_bytes_copied)
+    Ok(())
 }
 
 /// Copies `source` to `dest` using copy-on-write if possible.
diff --git a/src/uucore/src/lib/features/buf_copy.rs b/src/uucore/src/lib/features/buf_copy.rs
index 3ab2814bc24..bff94e94e38 100644
--- a/src/uucore/src/lib/features/buf_copy.rs
+++ b/src/uucore/src/lib/features/buf_copy.rs
@@ -75,9 +75,8 @@ mod tests {
         let thread = thread::spawn(move || {
             pipe_write.write_all(data).unwrap();
         });
-        let result = copy_stream(&mut pipe_read, &mut dest_file).unwrap();
+        copy_stream(&mut pipe_read, &mut dest_file).unwrap();
         thread.join().unwrap();
-        assert_eq!(result, data.len() as u64);
 
         // We would have been at the end already, so seek again to the start.
         dest_file.seek(SeekFrom::Start(0)).unwrap();
@@ -104,13 +103,12 @@ mod tests {
         src_file.sync_all().unwrap();
 
         let mut src_file = File::open(&src_path).unwrap();
-        let bytes_copied = copy_stream(&mut src_file, &mut dest_file).unwrap();
+        copy_stream(&mut src_file, &mut dest_file).unwrap();
 
         let mut dest_file = File::open(&dest_path).unwrap();
         let mut buf = Vec::new();
         dest_file.read_to_end(&mut buf).unwrap();
 
-        assert_eq!(bytes_copied as usize, data.len());
         assert_eq!(buf, data);
     }
 }
diff --git a/src/uucore/src/lib/features/buf_copy/linux.rs b/src/uucore/src/lib/features/buf_copy/linux.rs
index 3f7768794c0..592553b0956 100644
--- a/src/uucore/src/lib/features/buf_copy/linux.rs
+++ b/src/uucore/src/lib/features/buf_copy/linux.rs
@@ -48,12 +48,7 @@ impl From<rustix::io::Errno> for Error {
 /// # Arguments
 /// * `source` - `Read` implementor to copy data from.
 /// * `dest` - `Write` implementor to copy data to.
-///
-/// # Returns
-///
-/// Result of operation and bytes successfully written (as a `u64`) when
-/// operation is successful.
-pub fn copy_stream<R, S>(src: &mut R, dest: &mut S) -> UResult<u64>
+pub fn copy_stream<R, S>(src: &mut R, dest: &mut S) -> UResult<()>
 where
     R: Read + AsFd + AsRawFd,
     S: Write + AsFd + AsRawFd,
@@ -62,11 +57,11 @@ where
     // for faster writing. If it works, we're done.
     let result = splice_write(src, &dest.as_fd())?;
     if !result.1 {
-        return Ok(result.0);
+        return Ok(());
     }
 
     // If the splice() call failed, fall back on slower writing.
-    let result = std::io::copy(src, dest)?;
+    std::io::copy(src, dest)?;
 
     // If the splice() call failed and there has been some data written to
     // stdout via while loop above AND there will be second splice() call
@@ -74,7 +69,7 @@ where
     // the data buffered in stdout.lock. Therefore additional explicit flush
     // is required here.
     dest.flush()?;
-    Ok(result)
+    Ok(())
 }
 
 /// Write from source `handle` into destination `write_fd` using Linux-specific
diff --git a/src/uucore/src/lib/features/buf_copy/other.rs b/src/uucore/src/lib/features/buf_copy/other.rs
index 61dd13e6cea..6b435b8d02d 100644
--- a/src/uucore/src/lib/features/buf_copy/other.rs
+++ b/src/uucore/src/lib/features/buf_copy/other.rs
@@ -17,16 +17,11 @@ use crate::error::UResult;
 /// # Arguments
 /// * `source` - `Read` implementor to copy data from.
 /// * `dest` - `Write` implementor to copy data to.
-///
-/// # Returns
-///
-/// Result of operation and bytes successfully written (as a `u64`) when
-/// operation is successful.
-pub fn copy_stream<R, S>(src: &mut R, dest: &mut S) -> UResult<u64>
+pub fn copy_stream<R, S>(src: &mut R, dest: &mut S) -> UResult<()>
 where
     R: Read,
     S: Write,
 {
-    let result = std::io::copy(src, dest)?;
-    Ok(result)
+    std::io::copy(src, dest)?;
+    Ok(())
 }