diff --git a/src/shims/unix/fs.rs b/src/shims/unix/fs.rs
index a4439e21c5..d1b07f8807 100644
--- a/src/shims/unix/fs.rs
+++ b/src/shims/unix/fs.rs
@@ -143,11 +143,11 @@ impl FileDescription for FileHandle {
                 TRUE => Ok(()),
                 FALSE => {
                     let mut err = io::Error::last_os_error();
-                    let code = err.raw_os_error().and_then(u32::try_from).unwrap();
+                    let code: u32 = err.raw_os_error().unwrap().try_into().unwrap();
                     // Replace error with a custom WouldBlock error, which later will be mapped
-                    // in the `helpers.rs`
+                    // in the `helpers` module
                     if lock_nb && matches!(code, ERROR_IO_PENDING | ERROR_LOCK_VIOLATION) {
-                        let desc = format!("flock wouldblock error: {err}");
+                        let desc = format!("LockFileEx wouldblock error: {err}");
                         err = io::Error::new(io::ErrorKind::WouldBlock, desc);
                     }
                     Err(err)