diff --git a/src/libgetopts/lib.rs b/src/libgetopts/lib.rs
index eaec31a45f421..43e5ba8d49341 100644
--- a/src/libgetopts/lib.rs
+++ b/src/libgetopts/lib.rs
@@ -59,7 +59,7 @@
 //!     ];
 //!     let matches = match getopts(args.tail(), opts) {
 //!         Ok(m) => { m }
-//!         Err(f) => { fail!(f.to_string()) }
+//!         Err(f) => { fail!(f) }
 //!     };
 //!     if matches.opt_present("h") {
 //!         print_usage(program.as_slice(), opts);