diff --git a/src/cmp.rs b/src/cmp.rs
index 8f14868..468c677 100644
--- a/src/cmp.rs
+++ b/src/cmp.rs
@@ -71,9 +71,7 @@ fn is_stdout_dev_null() -> bool {
 }
 
 pub fn parse_params<I: Iterator<Item = OsString>>(mut opts: Peekable<I>) -> Result<Params, String> {
-    let Some(executable) = opts.next() else {
-        return Err("Usage: <exe> <from> <to>".to_string());
-    };
+    let executable = opts.next().ok_or("Usage: <exe> <from> <to>".to_string())?;
     let executable_str = executable.to_string_lossy().to_string();
 
     let parse_skip = |param: &str, skip_desc: &str| -> Result<SkipU64, String> {