diff --git a/src/mm.rs b/src/mm.rs
index f39b3b2..bb7b3d0 100644
--- a/src/mm.rs
+++ b/src/mm.rs
@@ -33,7 +33,7 @@ use getopt::GetOpt;
 use strerror::StrError;
 use sysexits::{ EX_IOERR, EX_USAGE };
 
-enum ArgMode{ In, Out }
+enum ArgMode { In, Out }
 
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<_>>();