diff --git a/src/internal/poll/copy_file_range_freebsd.go b/src/internal/poll/copy_file_range_freebsd.go
index 47d0de04ea..63fa013e46 100644
--- a/src/internal/poll/copy_file_range_freebsd.go
+++ b/src/internal/poll/copy_file_range_freebsd.go
@@ -22,7 +22,7 @@ func handleCopyFileRangeErr(err error, copied, written int64) (bool, error) {
 	switch err {
 	case syscall.ENOSYS:
 		// The copy_file_range(2) function first appeared in FreeBSD 13.0.
-		// Go supports FreeBSD>= 12, so the system call
+		// Go supports FreeBSD >= 12, so the system call
 		// may not be present. We've detected the FreeBSD version with
 		// unix.SupportCopyFileRange() at the beginning of this function,
 		// but we still want to check for ENOSYS here to prevent some rare
diff --git a/src/internal/poll/copy_file_range_unix.go b/src/internal/poll/copy_file_range_unix.go
index 73193a1991..833d553a27 100644
--- a/src/internal/poll/copy_file_range_unix.go
+++ b/src/internal/poll/copy_file_range_unix.go
@@ -24,7 +24,7 @@ func CopyFileRange(dst, src *FD, remain int64) (written int64, handled bool, err
 			max = maxCopyFileRangeRound
 		}
 		n, e := copyFileRange(dst, src, int(max))
-		if e == nil {
+		if n > 0 {
 			remain -= n
 			written += n
 		}