diff --git a/src/dp.rs b/src/dp.rs
index 0565b5545..e35eef6a9 100644
--- a/src/dp.rs
+++ b/src/dp.rs
@@ -17,6 +17,7 @@
 use num_bigint::{BigInt, BigUint, TryFromBigIntError};
 use num_rational::{BigRational, Ratio};
 use serde::{Deserialize, Serialize};
+use std::fmt;
 
 /// Errors propagated by methods in this module.
 #[derive(Debug, thiserror::Error)]
@@ -42,6 +43,12 @@ pub enum DpError {
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
 pub struct Rational(Ratio<BigUint>);
 
+impl fmt::Display for Rational {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
 impl Rational {
     /// Construct a [`Rational`] number from numerator `n` and denominator `d`. Errors if denominator is zero.
     pub fn from_unsigned<T>(n: T, d: T) -> Result<Self, DpError>