diff --git a/src/sys/termios.rs b/src/sys/termios.rs
index 8651a84da6..0afb78ab62 100644
--- a/src/sys/termios.rs
+++ b/src/sys/termios.rs
@@ -401,7 +401,7 @@ libc_enum! {
     }
 }
 
-// TODO: Make this usable directly as a slice index.
+#[repr(usize)]
 libc_enum! {
     /// Indices into the `termios.c_cc` array for special characters.
     #[repr(usize)]