diff --git a/src/util/uint.rs b/src/util/uint.rs
index f58bdcdb..064ce121 100644
--- a/src/util/uint.rs
+++ b/src/util/uint.rs
@@ -494,7 +494,7 @@ construct_uint!(Uint256, 4);
 construct_uint!(Uint128, 2);
 
 /// Invalid slice length
-#[derive(Debug, PartialEq, Eq, PartialOrd, Clone, Copy, Hash)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Hash)]
 /// Invalid slice length
 pub struct ParseLengthError {
     /// The length of the slice de-facto