diff --git a/src/fcntl.rs b/src/fcntl.rs
index 5dd05751cf..3b37356027 100644
--- a/src/fcntl.rs
+++ b/src/fcntl.rs
@@ -712,7 +712,7 @@ pub fn copy_file_range<Fd1: AsFd, Fd2: AsFd>(
             let ret = unsafe {
                 libc::syscall(
                     libc::SYS_copy_file_range,
-                    fd_in,
+                    fd_in.as_fd().as_raw_fd(),
                     off_in,
                     fd_out.as_fd().as_raw_fd(),
                     off_out,