diff --git a/Cargo.toml b/Cargo.toml
index 24ea488..8434644 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "malachite-bigint"
-version = "0.2.1"
+version = "0.2.2"
 authors = ["Steve Shi <shikangzhi@gmail.com>"]
 edition = "2021"
 license = "LGPL-3.0-only"
diff --git a/src/bigint.rs b/src/bigint.rs
index d10a06e..e568d53 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -79,7 +79,7 @@ impl Neg for Sign {
     From,
     Into,
 )]
-#[display("{}", "self.0")]
+#[display("{}", self.0)]
 #[into(owned, ref, ref_mut)]
 pub struct BigInt(Integer);
 
@@ -680,3 +680,9 @@ fn test_to_signed_bytes() {
     let i2 = BigInt::from_signed_bytes_le(&b);
     assert_eq!(i, i2);
 }
+
+#[test]
+fn test_display_bigint() {
+    let n = BigInt::from_str("1234567890").unwrap();
+    assert_eq!(format!("{}", n), "1234567890");
+}
diff --git a/src/biguint.rs b/src/biguint.rs
index 3906ebb..a08677f 100644
--- a/src/biguint.rs
+++ b/src/biguint.rs
@@ -54,7 +54,7 @@ impl_primitive_convert!(BigUint, f64);
     From,
     Into,
 )]
-#[display("{}", "self.0")]
+#[display("{}", self.0)]
 #[into(owned, ref, ref_mut)]
 pub struct BigUint(pub(crate) Natural);
 
@@ -487,3 +487,9 @@ impl BigUint {
 fn test_from_string_base() {
     assert!(BigUint::from_str_radix("1000000000000000111111100112abcdefg", 16).is_err());
 }
+
+#[test]
+fn test_display_biguint() {
+    let x = BigUint::from_str_radix("1234567890", 10).unwrap();
+    assert_eq!(format!("{}", x), "1234567890");
+}