diff --git a/src/lib.rs b/src/lib.rs
index d45235f..2bdd831 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,7 +19,7 @@ use core::{any::type_name, fmt, str::FromStr};
 /// See [module level documentation][crate]
 #[derive(Default, Hash, Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
 #[repr(transparent)]
-pub struct Secret<T>(T);
+pub struct Secret<T: ?Sized>(T);
 
 impl<T> Secret<T> {
     /// See [module level documentation][crate]